mirror of https://github.com/citusdata/citus.git
Add citus_stats UDF (#8026)
DESCRIPTION: Add `citus_stats` UDF This UDF acts on a Citus table, and provides `null_frac`, `most_common_vals` and `most_common_freqs` for each column in the table, based on the definitions of these columns in the Postgres view `pg_stats`. **Aggregated Views: pg\_stats > citus\_stats** citus\_stats, is a **view** intended for use in **Citus**, a distributed extension of PostgreSQL. It collects and returns **column-level** **statistics** for a distributed table—specifically, the **most common values**, their **frequencies,** and **fraction of null values**, like pg\_stats view does for regular Postgres tables. **Use Case** This view is useful when: - You need **column-level insights** on a distributed table. - You're performing **query optimization**, **cardinality estimation**, or **data profiling** across shards. **What It Returns** A **table** with: | Column Name | Data Type | Description | |---------------------|-----------|-----------------------------------------------------------------------------| | schemaname | text | Name of the schema containing the distributed table | | tablename | text | Name of the distributed table | | attname | text | Name of the column (attribute) | | null_frac | float4 | Estimated fraction of NULLs in the column across all shards | | most_common_vals | text[] | Array of most common values for the column | | most_common_freqs | float4[] | Array of corresponding frequencies (as fractions) of the most common values| **Caveats** - The function assumes that the array of the most common values among different shards will be the same, therefore it just adds everything up.pull/8130/head^2
Naisila Puka
GitHub
parent
bd0558fe39
commit
eaa609f510
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@ -14,6 +14,8 @@
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#include "udfs/citus_finish_pg_upgrade/13.2-1.sql"
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#include "udfs/citus_stats/13.2-1.sql"
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DO $drop_leftover_old_columnar_objects$
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BEGIN
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-- If old columnar exists, i.e., the columnar access method that we had before Citus 11.1,
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@ -25,3 +25,5 @@ DROP FUNCTION IF EXISTS pg_catalog.get_snapshot_based_node_split_plan(text, inte
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--
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-- If the user wants to create "citus_columnar" extension later, "citus_columnar"
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-- will anyway properly create them at the scope of that extension.
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DROP VIEW IF EXISTS pg_catalog.citus_stats;
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@ -0,0 +1,82 @@
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SET search_path = 'pg_catalog';
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DROP VIEW IF EXISTS pg_catalog.citus_stats;
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CREATE OR REPLACE VIEW citus.citus_stats AS
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WITH most_common_vals_double_json AS (
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SELECT ( SELECT json_agg(row_to_json(f)) FROM ( SELECT * FROM run_command_on_shards(logicalrelid,
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$$ SELECT json_agg(row_to_json(shard_stats)) FROM (
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SELECT '$$ || logicalrelid || $$' AS citus_table, attname, s.null_frac,
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most_common_vals, most_common_freqs, c.reltuples AS reltuples
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-- join on tablename is enough here, no need to join with pg_namespace
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-- since shards have unique ids in their names, hence two shard names
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-- could never be the same
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FROM pg_stats s RIGHT JOIN pg_class c ON (s.tablename = c.relname)
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WHERE c.oid = '%s'::regclass) shard_stats $$ ))f)
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FROM pg_dist_partition),
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most_common_vals_json AS (
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SELECT (json_array_elements(json_agg)->>'result') AS result,
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(json_array_elements(json_agg)->>'shardid') AS shardid
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FROM most_common_vals_double_json),
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table_reltuples_json AS (
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SELECT distinct(shardid),
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(json_array_elements(result::json)->>'reltuples')::bigint AS shard_reltuples,
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(json_array_elements(result::json)->>'citus_table')::regclass AS citus_table
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FROM most_common_vals_json),
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table_reltuples AS (
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SELECT citus_table, sum(shard_reltuples) AS table_reltuples
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FROM table_reltuples_json GROUP BY 1 ORDER BY 1),
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null_frac_json AS (
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SELECT (json_array_elements(result::json)->>'citus_table')::regclass AS citus_table,
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(json_array_elements(result::json)->>'reltuples')::bigint AS shard_reltuples,
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(json_array_elements(result::json)->>'null_frac')::float4 AS null_frac,
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(json_array_elements(result::json)->>'attname')::text AS attname
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FROM most_common_vals_json
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),
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null_occurrences AS (
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SELECT citus_table, attname, sum(null_frac * shard_reltuples)::bigint AS null_occurrences
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FROM null_frac_json
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GROUP BY 1, 2
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ORDER BY 1, 2
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),
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most_common_vals AS (
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SELECT (json_array_elements(result::json)->>'citus_table')::regclass AS citus_table,
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(json_array_elements(result::json)->>'attname')::text AS attname,
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json_array_elements_text((json_array_elements(result::json)->>'most_common_vals')::json)::text AS common_val,
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json_array_elements_text((json_array_elements(result::json)->>'most_common_freqs')::json)::float4 AS common_freq,
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(json_array_elements(result::json)->>'reltuples')::bigint AS shard_reltuples
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FROM most_common_vals_json),
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common_val_occurrence AS (
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SELECT citus_table, m.attname, common_val,
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sum(common_freq * shard_reltuples)::bigint AS occurrence
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FROM most_common_vals m
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GROUP BY citus_table, m.attname, common_val
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ORDER BY 1, 2, occurrence DESC)
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SELECT nsp.nspname AS schemaname, p.relname AS tablename, c.attname,
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CASE WHEN max(t.table_reltuples::bigint) = 0 THEN 0
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ELSE max(n.null_occurrences/t.table_reltuples)::float4 END AS null_frac,
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ARRAY_agg(common_val) AS most_common_vals,
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CASE WHEN max(t.table_reltuples::bigint) = 0 THEN NULL
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ELSE ARRAY_agg((occurrence/t.table_reltuples)::float4) END AS most_common_freqs
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FROM common_val_occurrence c, table_reltuples t, null_occurrences n, pg_class p, pg_namespace nsp
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WHERE c.citus_table = t.citus_table
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AND c.citus_table = n.citus_table AND c.attname = n.attname
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AND c.citus_table::regclass::oid = p.oid AND p.relnamespace = nsp.oid
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GROUP BY nsp.nspname, c.citus_table, p.relname, c.attname;
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ALTER VIEW citus.citus_stats SET SCHEMA pg_catalog;
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GRANT SELECT ON pg_catalog.citus_stats TO PUBLIC;
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RESET search_path;
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@ -0,0 +1,82 @@
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SET search_path = 'pg_catalog';
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DROP VIEW IF EXISTS pg_catalog.citus_stats;
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CREATE OR REPLACE VIEW citus.citus_stats AS
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WITH most_common_vals_double_json AS (
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SELECT ( SELECT json_agg(row_to_json(f)) FROM ( SELECT * FROM run_command_on_shards(logicalrelid,
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$$ SELECT json_agg(row_to_json(shard_stats)) FROM (
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SELECT '$$ || logicalrelid || $$' AS citus_table, attname, s.null_frac,
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most_common_vals, most_common_freqs, c.reltuples AS reltuples
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-- join on tablename is enough here, no need to join with pg_namespace
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-- since shards have unique ids in their names, hence two shard names
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-- could never be the same
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FROM pg_stats s RIGHT JOIN pg_class c ON (s.tablename = c.relname)
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WHERE c.oid = '%s'::regclass) shard_stats $$ ))f)
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FROM pg_dist_partition),
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most_common_vals_json AS (
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SELECT (json_array_elements(json_agg)->>'result') AS result,
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(json_array_elements(json_agg)->>'shardid') AS shardid
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FROM most_common_vals_double_json),
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table_reltuples_json AS (
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SELECT distinct(shardid),
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(json_array_elements(result::json)->>'reltuples')::bigint AS shard_reltuples,
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(json_array_elements(result::json)->>'citus_table')::regclass AS citus_table
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FROM most_common_vals_json),
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table_reltuples AS (
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SELECT citus_table, sum(shard_reltuples) AS table_reltuples
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FROM table_reltuples_json GROUP BY 1 ORDER BY 1),
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null_frac_json AS (
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SELECT (json_array_elements(result::json)->>'citus_table')::regclass AS citus_table,
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(json_array_elements(result::json)->>'reltuples')::bigint AS shard_reltuples,
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(json_array_elements(result::json)->>'null_frac')::float4 AS null_frac,
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(json_array_elements(result::json)->>'attname')::text AS attname
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FROM most_common_vals_json
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),
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null_occurrences AS (
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SELECT citus_table, attname, sum(null_frac * shard_reltuples)::bigint AS null_occurrences
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FROM null_frac_json
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GROUP BY 1, 2
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ORDER BY 1, 2
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),
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most_common_vals AS (
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SELECT (json_array_elements(result::json)->>'citus_table')::regclass AS citus_table,
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(json_array_elements(result::json)->>'attname')::text AS attname,
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json_array_elements_text((json_array_elements(result::json)->>'most_common_vals')::json)::text AS common_val,
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json_array_elements_text((json_array_elements(result::json)->>'most_common_freqs')::json)::float4 AS common_freq,
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(json_array_elements(result::json)->>'reltuples')::bigint AS shard_reltuples
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FROM most_common_vals_json),
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common_val_occurrence AS (
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SELECT citus_table, m.attname, common_val,
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sum(common_freq * shard_reltuples)::bigint AS occurrence
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FROM most_common_vals m
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GROUP BY citus_table, m.attname, common_val
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ORDER BY 1, 2, occurrence DESC)
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SELECT nsp.nspname AS schemaname, p.relname AS tablename, c.attname,
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CASE WHEN max(t.table_reltuples::bigint) = 0 THEN 0
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ELSE max(n.null_occurrences/t.table_reltuples)::float4 END AS null_frac,
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ARRAY_agg(common_val) AS most_common_vals,
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CASE WHEN max(t.table_reltuples::bigint) = 0 THEN NULL
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ELSE ARRAY_agg((occurrence/t.table_reltuples)::float4) END AS most_common_freqs
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FROM common_val_occurrence c, table_reltuples t, null_occurrences n, pg_class p, pg_namespace nsp
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WHERE c.citus_table = t.citus_table
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AND c.citus_table = n.citus_table AND c.attname = n.attname
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AND c.citus_table::regclass::oid = p.oid AND p.relnamespace = nsp.oid
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GROUP BY nsp.nspname, c.citus_table, p.relname, c.attname;
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ALTER VIEW citus.citus_stats SET SCHEMA pg_catalog;
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GRANT SELECT ON pg_catalog.citus_stats TO PUBLIC;
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RESET search_path;
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CREATE SCHEMA citus_aggregated_stats;
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SET search_path TO citus_aggregated_stats, public;
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SET citus.shard_count = 2;
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SET citus.next_shard_id TO 1870000;
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CREATE USER user1;
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GRANT ALL ON SCHEMA citus_aggregated_stats TO user1;
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SET SESSION AUTHORIZATION user1;
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CREATE TABLE current_check (currentid int, payload text, rlsuser text);
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GRANT ALL ON current_check TO PUBLIC;
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INSERT INTO current_check VALUES
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(1, 'abc', 'user1'),
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(3, 'cde', 'user1'),
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(4, 'def', 'user1'),
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(4, 'def', 'user1'),
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(3, 'cde', 'user2'),
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(5, NULL, NULL),
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(4, 'def', 'user1');
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ALTER TABLE current_check ENABLE ROW LEVEL SECURITY;
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SET row_security TO ON;
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ANALYZE current_check;
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SELECT schemaname, tablename, attname, null_frac, most_common_vals, most_common_freqs FROM pg_stats
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WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
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ORDER BY 1;
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schemaname | tablename | attname | null_frac | most_common_vals | most_common_freqs
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---------------------------------------------------------------------
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citus_aggregated_stats | current_check | currentid | 0 | {4,3} | {0.428571,0.285714}
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citus_aggregated_stats | current_check | payload | 0.142857 | {def,cde} | {0.428571,0.285714}
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citus_aggregated_stats | current_check | rlsuser | 0.142857 | {user1} | {0.714286}
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(3 rows)
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SELECT * FROM citus_stats
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WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
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ORDER BY 1;
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schemaname | tablename | attname | null_frac | most_common_vals | most_common_freqs
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---------------------------------------------------------------------
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(0 rows)
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-- test various Citus table types in citus_stats
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CREATE TABLE dist_current_check (currentid int, payload text, rlsuser text);
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CREATE TABLE ref_current_check (currentid int, payload text, rlsuser text);
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CREATE TABLE citus_local_current_check (currentid int, payload text, rlsuser text);
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SELECT create_distributed_table('dist_current_check', 'currentid');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_reference_table('ref_current_check');
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create_reference_table
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---------------------------------------------------------------------
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(1 row)
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SELECT citus_add_local_table_to_metadata('citus_local_current_check');
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citus_add_local_table_to_metadata
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---------------------------------------------------------------------
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(1 row)
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INSERT INTO dist_current_check VALUES
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(1, 'abc', 'user1'),
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(3, 'cde', 'user1'),
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(4, 'def', 'user1'),
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(4, 'def', 'user1'),
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(3, 'cde', 'user2'),
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(5, NULL, NULL),
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(4, 'def', 'user1');
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INSERT INTO ref_current_check VALUES
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(1, 'abc', 'user1'),
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(3, 'cde', 'user1'),
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(4, 'def', 'user1'),
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(4, 'def', 'user1'),
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(3, 'cde', 'user2'),
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(5, NULL, NULL),
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(4, 'def', 'user1');
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INSERT INTO citus_local_current_check VALUES
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(1, 'abc', 'user1'),
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(3, 'cde', 'user1'),
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(4, 'def', 'user1'),
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(4, 'def', 'user1'),
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(3, 'cde', 'user2'),
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(5, NULL, NULL),
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(4, 'def', 'user1');
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ANALYZE dist_current_check;
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ANALYZE ref_current_check;
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ANALYZE citus_local_current_check;
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SELECT schemaname, tablename, attname, null_frac, most_common_vals, most_common_freqs FROM pg_stats
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WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
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ORDER BY 1;
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schemaname | tablename | attname | null_frac | most_common_vals | most_common_freqs
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---------------------------------------------------------------------
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citus_aggregated_stats | current_check | currentid | 0 | {4,3} | {0.428571,0.285714}
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citus_aggregated_stats | current_check | payload | 0.142857 | {def,cde} | {0.428571,0.285714}
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citus_aggregated_stats | current_check | rlsuser | 0.142857 | {user1} | {0.714286}
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(3 rows)
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SELECT * FROM citus_stats
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WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
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ORDER BY 1;
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schemaname | tablename | attname | null_frac | most_common_vals | most_common_freqs
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---------------------------------------------------------------------
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citus_aggregated_stats | dist_current_check | currentid | 0 | {4,3} | {0.428571,0.285714}
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citus_aggregated_stats | dist_current_check | payload | 0.142857 | {def,cde} | {0.428571,0.285714}
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citus_aggregated_stats | dist_current_check | rlsuser | 0.142857 | {user1} | {0.714286}
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citus_aggregated_stats | ref_current_check | currentid | 0 | {4,3} | {0.428571,0.285714}
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citus_aggregated_stats | ref_current_check | payload | 0.142857 | {def,cde} | {0.428571,0.285714}
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citus_aggregated_stats | ref_current_check | rlsuser | 0.142857 | {user1} | {0.714286}
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citus_aggregated_stats | citus_local_current_check | currentid | 0 | {4,3} | {0.428571,0.285714}
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citus_aggregated_stats | citus_local_current_check | payload | 0.142857 | {def,cde} | {0.428571,0.285714}
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citus_aggregated_stats | citus_local_current_check | rlsuser | 0.142857 | {user1} | {0.714286}
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(9 rows)
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RESET SESSION AUTHORIZATION;
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DROP SCHEMA citus_aggregated_stats CASCADE;
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NOTICE: drop cascades to 6 other objects
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DETAIL: drop cascades to table current_check
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drop cascades to table dist_current_check
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drop cascades to table ref_current_check
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drop cascades to table citus_local_current_check_1870003
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drop cascades to table ref_current_check_1870002
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drop cascades to table citus_local_current_check
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DROP USER user1;
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@ -1649,7 +1649,8 @@ SELECT * FROM multi_extension.print_extension_changes();
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| function citus_remove_clone_node_with_nodeid(integer) void
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| function get_snapshot_based_node_split_plan(text,integer,text,integer,name) TABLE(table_name regclass, shardid bigint, shard_size bigint, placement_node text)
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| function worker_last_saved_explain_analyze() TABLE(explain_analyze_output text, execution_duration double precision, execution_ntuples double precision, execution_nloops double precision)
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(11 rows)
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| view citus_stats
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(12 rows)
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DROP TABLE multi_extension.prev_objects, multi_extension.extension_diff;
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-- show running version
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view citus_stat_statements
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view citus_stat_tenants
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view citus_stat_tenants_local
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view citus_stats
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view citus_tables
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view pg_dist_shard_placement
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view time_partitions
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(369 rows)
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(370 rows)
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DROP TABLE extension_basic_types;
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@ -32,6 +32,7 @@ test: propagate_extension_commands
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test: escape_extension_name
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test: ref_citus_local_fkeys
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test: alter_database_owner
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test: citus_aggregated_stats
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test: seclabel
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test: distributed_triggers
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test: create_single_shard_table
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CREATE SCHEMA citus_aggregated_stats;
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SET search_path TO citus_aggregated_stats, public;
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SET citus.shard_count = 2;
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SET citus.next_shard_id TO 1870000;
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CREATE USER user1;
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GRANT ALL ON SCHEMA citus_aggregated_stats TO user1;
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SET SESSION AUTHORIZATION user1;
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CREATE TABLE current_check (currentid int, payload text, rlsuser text);
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GRANT ALL ON current_check TO PUBLIC;
|
||||
|
||||
INSERT INTO current_check VALUES
|
||||
(1, 'abc', 'user1'),
|
||||
(3, 'cde', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(3, 'cde', 'user2'),
|
||||
(5, NULL, NULL),
|
||||
(4, 'def', 'user1');
|
||||
|
||||
ALTER TABLE current_check ENABLE ROW LEVEL SECURITY;
|
||||
|
||||
SET row_security TO ON;
|
||||
|
||||
ANALYZE current_check;
|
||||
|
||||
SELECT schemaname, tablename, attname, null_frac, most_common_vals, most_common_freqs FROM pg_stats
|
||||
WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
|
||||
ORDER BY 1;
|
||||
|
||||
SELECT * FROM citus_stats
|
||||
WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
|
||||
ORDER BY 1;
|
||||
|
||||
-- test various Citus table types in citus_stats
|
||||
CREATE TABLE dist_current_check (currentid int, payload text, rlsuser text);
|
||||
CREATE TABLE ref_current_check (currentid int, payload text, rlsuser text);
|
||||
CREATE TABLE citus_local_current_check (currentid int, payload text, rlsuser text);
|
||||
|
||||
SELECT create_distributed_table('dist_current_check', 'currentid');
|
||||
SELECT create_reference_table('ref_current_check');
|
||||
SELECT citus_add_local_table_to_metadata('citus_local_current_check');
|
||||
|
||||
INSERT INTO dist_current_check VALUES
|
||||
(1, 'abc', 'user1'),
|
||||
(3, 'cde', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(3, 'cde', 'user2'),
|
||||
(5, NULL, NULL),
|
||||
(4, 'def', 'user1');
|
||||
|
||||
INSERT INTO ref_current_check VALUES
|
||||
(1, 'abc', 'user1'),
|
||||
(3, 'cde', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(3, 'cde', 'user2'),
|
||||
(5, NULL, NULL),
|
||||
(4, 'def', 'user1');
|
||||
|
||||
INSERT INTO citus_local_current_check VALUES
|
||||
(1, 'abc', 'user1'),
|
||||
(3, 'cde', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(4, 'def', 'user1'),
|
||||
(3, 'cde', 'user2'),
|
||||
(5, NULL, NULL),
|
||||
(4, 'def', 'user1');
|
||||
|
||||
ANALYZE dist_current_check;
|
||||
ANALYZE ref_current_check;
|
||||
ANALYZE citus_local_current_check;
|
||||
|
||||
SELECT schemaname, tablename, attname, null_frac, most_common_vals, most_common_freqs FROM pg_stats
|
||||
WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
|
||||
ORDER BY 1;
|
||||
|
||||
SELECT * FROM citus_stats
|
||||
WHERE tablename IN ('current_check', 'dist_current_check', 'ref_current_check', 'citus_local_current_check')
|
||||
ORDER BY 1;
|
||||
|
||||
RESET SESSION AUTHORIZATION;
|
||||
DROP SCHEMA citus_aggregated_stats CASCADE;
|
||||
DROP USER user1;
|
||||
Loading…
Reference in New Issue