In Postgres 9.6, Why GIN index is not used for a JSONB column with text/int array?
0
In Postgres 9.6, why the GIN index is not used on my SELECT query below for a JSONB column with text/int array? How do i force Postgres to us GIN index?
SET enable_seqscan to FALSE;
EXPLAIN ANALYZE SELECT * FROM items WHERE int_array_cast(metadata->>'types') @> '{52, 53}'
Output of EXPLAIN
Seq Scan on items (cost=10000000000.00..10000000016.07 rows=1 width=2391) (actual time=0.073..0.117 rows=1 loops=1)
Filter: (int_array_cast((metadata ->> 'types'::text)) @> '{10,14}'::integer)
Rows Removed by Filter: 37
Planning Time: 0.201 ms
Execution Time: 0.197 ms
Table Structure
CREATE TABLE "items" (
"item_uuid" UUid NOT NULL,
"metadata" JSONB,
PRIMARY KEY ("item_uuid")
);
int_array_cast function defintion
CREATE OR REPLACE FUNCTION int_array_cast(TEXT) RETURNS INT
AS
$$
SELECT CAST($1 AS INT)
$$
IMMUTABLE
LANGUAGE SQL
RETURNS NULL ON NULL INPUT
Index created using GIN
CREATE INDEX IF NOT EXISTS items_metadata_dok_index ON items USING GIN(int_array_cast(metadata->>'types'))
Sample items in the table
item_uuid | metadata
1 | {"types":"{1,2}", "name": "item_name1"}
2 | {"types":"{10,11}", "name": "item_name2"}
3 | {"types":"12", "name": "item_name3"}
3 | {"name": "item_name4"}
postgresql postgresql-performance postgresql-9.6
asked 3 mins ago
Bharathi RamBharathi Ram
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0
In Postgres 9.6, why the GIN index is not used on my SELECT query below for a JSONB column with text/int array? How do i force Postgres to us GIN index?
SET enable_seqscan to FALSE;
EXPLAIN ANALYZE SELECT * FROM items WHERE int_array_cast(metadata->>'types') @> '{52, 53}'
Output of EXPLAIN
Seq Scan on items (cost=10000000000.00..10000000016.07 rows=1 width=2391) (actual time=0.073..0.117 rows=1 loops=1)
Filter: (int_array_cast((metadata ->> 'types'::text)) @> '{10,14}'::integer)
Rows Removed by Filter: 37
Planning Time: 0.201 ms
Execution Time: 0.197 ms
Table Structure
CREATE TABLE "items" (
"item_uuid" UUid NOT NULL,
"metadata" JSONB,
PRIMARY KEY ("item_uuid")
);
int_array_cast function defintion
CREATE OR REPLACE FUNCTION int_array_cast(TEXT) RETURNS INT
AS
$$
SELECT CAST($1 AS INT)
$$
IMMUTABLE
LANGUAGE SQL
RETURNS NULL ON NULL INPUT
Index created using GIN
CREATE INDEX IF NOT EXISTS items_metadata_dok_index ON items USING GIN(int_array_cast(metadata->>'types'))
Sample items in the table
item_uuid | metadata
1 | {"types":"{1,2}", "name": "item_name1"}
2 | {"types":"{10,11}", "name": "item_name2"}
3 | {"types":"12", "name": "item_name3"}
3 | {"name": "item_name4"}
postgresql postgresql-performance postgresql-9.6
asked 3 mins ago
Bharathi RamBharathi Ram
11
New contributor
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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0
In Postgres 9.6, why the GIN index is not used on my SELECT query below for a JSONB column with text/int array? How do i force Postgres to us GIN index?
SET enable_seqscan to FALSE;
EXPLAIN ANALYZE SELECT * FROM items WHERE int_array_cast(metadata->>'types') @> '{52, 53}'
Output of EXPLAIN
Seq Scan on items (cost=10000000000.00..10000000016.07 rows=1 width=2391) (actual time=0.073..0.117 rows=1 loops=1)
Filter: (int_array_cast((metadata ->> 'types'::text)) @> '{10,14}'::integer)
Rows Removed by Filter: 37
Planning Time: 0.201 ms
Execution Time: 0.197 ms
Table Structure
CREATE TABLE "items" (
"item_uuid" UUid NOT NULL,
"metadata" JSONB,
PRIMARY KEY ("item_uuid")
);
int_array_cast function defintion
CREATE OR REPLACE FUNCTION int_array_cast(TEXT) RETURNS INT
AS
$$
SELECT CAST($1 AS INT)
$$
IMMUTABLE
LANGUAGE SQL
RETURNS NULL ON NULL INPUT
Index created using GIN
CREATE INDEX IF NOT EXISTS items_metadata_dok_index ON items USING GIN(int_array_cast(metadata->>'types'))
Sample items in the table
item_uuid | metadata
1 | {"types":"{1,2}", "name": "item_name1"}
2 | {"types":"{10,11}", "name": "item_name2"}
3 | {"types":"12", "name": "item_name3"}
3 | {"name": "item_name4"}
postgresql postgresql-performance postgresql-9.6
asked 3 mins ago
Bharathi RamBharathi Ram
11
New contributor
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
In Postgres 9.6, why the GIN index is not used on my SELECT query below for a JSONB column with text/int array? How do i force Postgres to us GIN index?
SET enable_seqscan to FALSE;
EXPLAIN ANALYZE SELECT * FROM items WHERE int_array_cast(metadata->>'types') @> '{52, 53}'
Output of EXPLAIN
Seq Scan on items (cost=10000000000.00..10000000016.07 rows=1 width=2391) (actual time=0.073..0.117 rows=1 loops=1)
Filter: (int_array_cast((metadata ->> 'types'::text)) @> '{10,14}'::integer)
Rows Removed by Filter: 37
Planning Time: 0.201 ms
Execution Time: 0.197 ms
Table Structure
CREATE TABLE "items" (
"item_uuid" UUid NOT NULL,
"metadata" JSONB,
PRIMARY KEY ("item_uuid")
);
int_array_cast function defintion
CREATE OR REPLACE FUNCTION int_array_cast(TEXT) RETURNS INT
AS
$$
SELECT CAST($1 AS INT)
$$
IMMUTABLE
LANGUAGE SQL
RETURNS NULL ON NULL INPUT
Index created using GIN
CREATE INDEX IF NOT EXISTS items_metadata_dok_index ON items USING GIN(int_array_cast(metadata->>'types'))
Sample items in the table
item_uuid | metadata
1 | {"types":"{1,2}", "name": "item_name1"}
2 | {"types":"{10,11}", "name": "item_name2"}
3 | {"types":"12", "name": "item_name3"}
3 | {"name": "item_name4"}
postgresql postgresql-performance postgresql-9.6
postgresql postgresql-performance postgresql-9.6
asked 3 mins ago
Bharathi RamBharathi Ram
11
New contributor
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
Bharathi RamBharathi Ram
11
New contributor
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
Bharathi RamBharathi Ram
11
New contributor
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
Bharathi RamBharathi Ram
11
asked 3 mins ago
Bharathi RamBharathi Ram
11
11
New contributor
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Bharathi Ram is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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