mirror of https://github.com/citusdata/citus.git
33 lines
1.4 KiB
SQL
33 lines
1.4 KiB
SQL
-- columnar--10.1-1--10.2-1.sql
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-- For a proper mapping between tid & (stripe, row_num), add a new column to
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-- columnar.stripe and define a BTREE index on this column.
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-- Also include storage_id column for per-relation scans.
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ALTER TABLE columnar.stripe ADD COLUMN first_row_number bigint;
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CREATE INDEX stripe_first_row_number_idx ON columnar.stripe USING BTREE(storage_id, first_row_number);
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-- Populate first_row_number column of columnar.stripe table.
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--
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-- For simplicity, we calculate MAX(row_count) value across all the stripes
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-- of all the columanar tables and then use it to populate first_row_number
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-- column. This would introduce some gaps however we are okay with that since
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-- it's already the case with regular INSERT/COPY's.
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DO $$
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DECLARE
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max_row_count bigint;
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-- this should be equal to columnar_storage.h/COLUMNAR_FIRST_ROW_NUMBER
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COLUMNAR_FIRST_ROW_NUMBER constant bigint := 1;
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BEGIN
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SELECT MAX(row_count) INTO max_row_count FROM columnar.stripe;
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UPDATE columnar.stripe SET first_row_number = COLUMNAR_FIRST_ROW_NUMBER +
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(stripe_num - 1) * max_row_count;
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END;
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$$;
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#include "udfs/upgrade_columnar_storage/10.2-1.sql"
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#include "udfs/downgrade_columnar_storage/10.2-1.sql"
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-- upgrade storage for all columnar relations
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SELECT citus_internal.upgrade_columnar_storage(c.oid) FROM pg_class c, pg_am a
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WHERE c.relam = a.oid AND amname = 'columnar';
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