mirror of https://github.com/citusdata/citus.git
72 lines
2.5 KiB
SQL
72 lines
2.5 KiB
SQL
CREATE OR REPLACE VIEW citus.citus_shards AS
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SELECT
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pg_dist_shard.logicalrelid AS table_name,
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pg_dist_shard.shardid,
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shard_name(pg_dist_shard.logicalrelid, pg_dist_shard.shardid) as shard_name,
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CASE WHEN colocationid IN (SELECT colocationid FROM pg_dist_schema) THEN 'schema'
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WHEN partkey IS NOT NULL THEN 'distributed'
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WHEN repmodel = 't' THEN 'reference'
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WHEN colocationid = 0 THEN 'local'
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ELSE 'distributed' END AS citus_table_type,
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colocationid AS colocation_id,
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pg_dist_node.nodename,
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pg_dist_node.nodeport,
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size as shard_size,
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CASE
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WHEN NOT pg_dist_shard.needsseparatenode THEN false
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ELSE
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-- has_separate_node = true if the node doesn't have any other shard
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-- placements except the ones that belong to the same shard group.
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NOT EXISTS (
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SELECT 1
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FROM pg_dist_shard pds1
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JOIN pg_dist_placement pdp1 USING (shardid)
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JOIN pg_dist_partition pdp2 USING (logicalrelid)
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WHERE
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-- get the distributed table placements that are placed on the same node as this placement
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pdp1.groupid = pg_dist_placement.groupid AND
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(pdp2.partkey IS NOT NULL OR (pdp2.repmodel != 't' AND pdp2.colocationid != 0)) AND
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-- filter out all the placements that belong to the same shard group
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NOT (
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pdp2.colocationid = pg_dist_partition.colocationid AND
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((pds1.shardminvalue IS NULL AND pg_dist_shard.shardminvalue IS NULL) OR (pds1.shardminvalue = pg_dist_shard.shardminvalue))
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)
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)
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END AS has_separate_node
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FROM
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pg_dist_shard
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JOIN
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pg_dist_placement
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ON
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pg_dist_shard.shardid = pg_dist_placement.shardid
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JOIN
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pg_dist_node
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ON
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pg_dist_placement.groupid = pg_dist_node.groupid
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JOIN
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pg_dist_partition
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ON
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pg_dist_partition.logicalrelid = pg_dist_shard.logicalrelid
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LEFT JOIN
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(SELECT shard_id, max(size) as size from citus_shard_sizes() GROUP BY shard_id) as shard_sizes
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ON
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pg_dist_shard.shardid = shard_sizes.shard_id
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WHERE
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pg_dist_placement.shardstate = 1
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AND
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-- filter out tables owned by extensions
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pg_dist_partition.logicalrelid NOT IN (
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SELECT
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objid
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FROM
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pg_depend
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WHERE
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classid = 'pg_class'::regclass AND refclassid = 'pg_extension'::regclass AND deptype = 'e'
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)
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ORDER BY
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pg_dist_shard.logicalrelid::text, shardid
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;
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ALTER VIEW citus.citus_shards SET SCHEMA pg_catalog;
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GRANT SELECT ON pg_catalog.citus_shards TO public;
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