postgres_fdw: When sending ORDER BY, always include NULLS FIRST/LAST.
Previously, we included NULLS FIRST when appropriate but relied on the default behavior to be NULLS LAST. This is, however, not true for a sort in descending order and seems like a fragile assumption anyway. Report by Rajkumar Raghuwanshi. Patch by Ashutosh Bapat. Review comments from Michael Paquier and Tom Lane.
This commit is contained in:
Robert Haas
parent
52fe6f4e02
commit
3bea3f88d5
3 changed files with 125 additions and 31 deletions
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@ -2308,6 +2308,8 @@ appendOrderByClause(List *pathkeys, deparse_expr_cxt *context)
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if (pathkey->pk_nulls_first)
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appendStringInfoString(buf, " NULLS FIRST");
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else
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appendStringInfoString(buf, " NULLS LAST");
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delim = ", ";
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}
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@ -245,13 +245,13 @@ SELECT * FROM ft1 t1 ORDER BY t1.c3, t1.c1, t1.tableoid OFFSET 100 LIMIT 10;
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-- whole-row reference
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EXPLAIN (VERBOSE, COSTS false) SELECT t1 FROM ft1 t1 ORDER BY t1.c3, t1.c1 OFFSET 100 LIMIT 10;
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QUERY PLAN
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----------------------------------------------------------------------------------------------------------
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QUERY PLAN
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--------------------------------------------------------------------------------------------------------------------------------
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Limit
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Output: t1.*, c3, c1
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-> Foreign Scan on public.ft1 t1
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Output: t1.*, c3, c1
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" ORDER BY c3 ASC, "C 1" ASC
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" ORDER BY c3 ASC NULLS LAST, "C 1" ASC NULLS LAST
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(5 rows)
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SELECT t1 FROM ft1 t1 ORDER BY t1.c3, t1.c1 OFFSET 100 LIMIT 10;
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@ -382,8 +382,8 @@ SET enable_nestloop TO false;
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-- inner join; expressions in the clauses appear in the equivalence class list
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EXPLAIN (VERBOSE, COSTS false)
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SELECT t1.c1, t2."C 1" FROM ft2 t1 JOIN "S 1"."T 1" t2 ON (t1.c1 = t2."C 1") OFFSET 100 LIMIT 10;
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QUERY PLAN
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----------------------------------------------------------------------------
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QUERY PLAN
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---------------------------------------------------------------------------------------
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Limit
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Output: t1.c1, t2."C 1"
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-> Merge Join
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@ -391,7 +391,7 @@ EXPLAIN (VERBOSE, COSTS false)
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Merge Cond: (t1.c1 = t2."C 1")
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-> Foreign Scan on public.ft2 t1
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Output: t1.c1
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC NULLS LAST
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-> Index Only Scan using t1_pkey on "S 1"."T 1" t2
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Output: t2."C 1"
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(10 rows)
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@ -415,8 +415,8 @@ SELECT t1.c1, t2."C 1" FROM ft2 t1 JOIN "S 1"."T 1" t2 ON (t1.c1 = t2."C 1") OFF
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-- list but no output change as compared to the previous query
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EXPLAIN (VERBOSE, COSTS false)
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SELECT t1.c1, t2."C 1" FROM ft2 t1 LEFT JOIN "S 1"."T 1" t2 ON (t1.c1 = t2."C 1") OFFSET 100 LIMIT 10;
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QUERY PLAN
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----------------------------------------------------------------------------
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QUERY PLAN
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---------------------------------------------------------------------------------------
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Limit
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Output: t1.c1, t2."C 1"
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-> Merge Left Join
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@ -424,7 +424,7 @@ EXPLAIN (VERBOSE, COSTS false)
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Merge Cond: (t1.c1 = t2."C 1")
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-> Foreign Scan on public.ft2 t1
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Output: t1.c1
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC NULLS LAST
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-> Index Only Scan using t1_pkey on "S 1"."T 1" t2
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Output: t2."C 1"
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(10 rows)
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@ -1341,8 +1341,8 @@ SELECT t1.ctid, t1, t2, t1.c1 FROM ft1 t1 JOIN ft2 t2 ON (t1.c1 = t2.c1) ORDER B
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-- SEMI JOIN, not pushed down
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EXPLAIN (COSTS false, VERBOSE)
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SELECT t1.c1 FROM ft1 t1 WHERE EXISTS (SELECT 1 FROM ft2 t2 WHERE t1.c1 = t2.c1) ORDER BY t1.c1 OFFSET 100 LIMIT 10;
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QUERY PLAN
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----------------------------------------------------------------------------------
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QUERY PLAN
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---------------------------------------------------------------------------------------------
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Limit
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Output: t1.c1
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-> Merge Semi Join
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@ -1350,12 +1350,12 @@ SELECT t1.c1 FROM ft1 t1 WHERE EXISTS (SELECT 1 FROM ft2 t2 WHERE t1.c1 = t2.c1)
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Merge Cond: (t1.c1 = t2.c1)
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-> Foreign Scan on public.ft1 t1
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Output: t1.c1
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC NULLS LAST
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-> Materialize
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Output: t2.c1
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-> Foreign Scan on public.ft2 t2
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Output: t2.c1
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC NULLS LAST
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(13 rows)
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SELECT t1.c1 FROM ft1 t1 WHERE EXISTS (SELECT 1 FROM ft2 t2 WHERE t1.c1 = t2.c1) ORDER BY t1.c1 OFFSET 100 LIMIT 10;
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@ -1376,8 +1376,8 @@ SELECT t1.c1 FROM ft1 t1 WHERE EXISTS (SELECT 1 FROM ft2 t2 WHERE t1.c1 = t2.c1)
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-- ANTI JOIN, not pushed down
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EXPLAIN (COSTS false, VERBOSE)
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SELECT t1.c1 FROM ft1 t1 WHERE NOT EXISTS (SELECT 1 FROM ft2 t2 WHERE t1.c1 = t2.c2) ORDER BY t1.c1 OFFSET 100 LIMIT 10;
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QUERY PLAN
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----------------------------------------------------------------------------
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QUERY PLAN
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---------------------------------------------------------------------------------------
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Limit
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Output: t1.c1
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-> Merge Anti Join
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@ -1385,12 +1385,12 @@ SELECT t1.c1 FROM ft1 t1 WHERE NOT EXISTS (SELECT 1 FROM ft2 t2 WHERE t1.c1 = t2
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Merge Cond: (t1.c1 = t2.c2)
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-> Foreign Scan on public.ft1 t1
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Output: t1.c1
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC
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Remote SQL: SELECT "C 1" FROM "S 1"."T 1" ORDER BY "C 1" ASC NULLS LAST
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-> Materialize
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Output: t2.c2
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-> Foreign Scan on public.ft2 t2
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Output: t2.c2
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Remote SQL: SELECT c2 FROM "S 1"."T 1" ORDER BY c2 ASC
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Remote SQL: SELECT c2 FROM "S 1"."T 1" ORDER BY c2 ASC NULLS LAST
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(13 rows)
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SELECT t1.c1 FROM ft1 t1 WHERE NOT EXISTS (SELECT 1 FROM ft2 t2 WHERE t1.c1 = t2.c2) ORDER BY t1.c1 OFFSET 100 LIMIT 10;
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@ -1448,8 +1448,8 @@ SELECT t1.c1, t2.c1 FROM ft1 t1 CROSS JOIN ft2 t2 ORDER BY t1.c1, t2.c1 OFFSET 1
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-- different server, not pushed down. No result expected.
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EXPLAIN (COSTS false, VERBOSE)
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SELECT t1.c1, t2.c1 FROM ft5 t1 JOIN ft6 t2 ON (t1.c1 = t2.c1) ORDER BY t1.c1, t2.c1 OFFSET 100 LIMIT 10;
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QUERY PLAN
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----------------------------------------------------------------------------
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QUERY PLAN
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---------------------------------------------------------------------------------------
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Limit
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Output: t1.c1, t2.c1
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-> Merge Join
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@ -1457,12 +1457,12 @@ SELECT t1.c1, t2.c1 FROM ft5 t1 JOIN ft6 t2 ON (t1.c1 = t2.c1) ORDER BY t1.c1, t
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Merge Cond: (t2.c1 = t1.c1)
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-> Foreign Scan on public.ft6 t2
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Output: t2.c1, t2.c2, t2.c3
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC NULLS LAST
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-> Materialize
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Output: t1.c1, t1.c2, t1.c3
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-> Foreign Scan on public.ft5 t1
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Output: t1.c1, t1.c2, t1.c3
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC NULLS LAST
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(13 rows)
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SELECT t1.c1, t2.c1 FROM ft5 t1 JOIN ft6 t2 ON (t1.c1 = t2.c1) ORDER BY t1.c1, t2.c1 OFFSET 100 LIMIT 10;
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@ -1746,8 +1746,8 @@ EXECUTE join_stmt;
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-- different user mappings
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CREATE USER MAPPING FOR view_owner SERVER loopback;
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EXPLAIN (COSTS false, VERBOSE) EXECUTE join_stmt;
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QUERY PLAN
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----------------------------------------------------------------------------
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QUERY PLAN
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---------------------------------------------------------------------------------------
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Limit
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Output: t1.c1, ft5.c1
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-> Merge Join
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@ -1755,12 +1755,12 @@ EXPLAIN (COSTS false, VERBOSE) EXECUTE join_stmt;
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Merge Cond: (t1.c1 = ft5.c1)
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-> Foreign Scan on public.ft5 t1
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Output: t1.c1, t1.c2, t1.c3
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC NULLS LAST
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-> Materialize
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Output: ft5.c1, ft5.c2, ft5.c3
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-> Foreign Scan on public.ft5
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Output: ft5.c1, ft5.c2, ft5.c3
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC
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Remote SQL: SELECT c1 FROM "S 1"."T 4" ORDER BY c1 ASC NULLS LAST
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(13 rows)
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EXECUTE join_stmt;
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@ -3813,6 +3813,86 @@ select c2, count(*) from "S 1"."T 1" where c2 < 500 group by 1 order by 1;
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407 | 100
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(13 rows)
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-- Above DMLs add data with c6 as NULL in ft1, so test ORDER BY NULLS LAST and NULLs
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-- FIRST behavior here.
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-- ORDER BY DESC NULLS LAST options
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 ORDER BY c6 DESC NULLS LAST, c1 OFFSET 795 LIMIT 10;
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QUERY PLAN
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---------------------------------------------------------------------------------------------------------------------------------
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Limit
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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-> Foreign Scan on public.ft1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" ORDER BY c6 DESC NULLS LAST, "C 1" ASC NULLS LAST
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(5 rows)
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SELECT * FROM ft1 ORDER BY c6 DESC NULLS LAST, c1 OFFSET 795 LIMIT 10;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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------+-----+--------------------+------------------------------+--------------------------+------+------------+-----
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960 | 42 | 00960_trig_update | Mon Mar 02 00:00:00 1970 PST | Mon Mar 02 00:00:00 1970 | 0 | 0 | foo
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970 | 42 | 00970_trig_update | Thu Mar 12 00:00:00 1970 PST | Thu Mar 12 00:00:00 1970 | 0 | 0 | foo
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980 | 42 | 00980_trig_update | Sun Mar 22 00:00:00 1970 PST | Sun Mar 22 00:00:00 1970 | 0 | 0 | foo
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990 | 42 | 00990_trig_update | Wed Apr 01 00:00:00 1970 PST | Wed Apr 01 00:00:00 1970 | 0 | 0 | foo
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1000 | 42 | 01000_trig_update | Thu Jan 01 00:00:00 1970 PST | Thu Jan 01 00:00:00 1970 | 0 | 0 | foo
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1218 | 818 | ggg_trig_update | | | (--; | ft2 |
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1001 | 101 | 0000100001 | | | | ft2 |
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1003 | 403 | 0000300003_update3 | | | | ft2 |
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1004 | 104 | 0000400004 | | | | ft2 |
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1006 | 106 | 0000600006 | | | | ft2 |
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(10 rows)
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-- ORDER BY DESC NULLS FIRST options
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 ORDER BY c6 DESC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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QUERY PLAN
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----------------------------------------------------------------------------------------------------------------------------------
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Limit
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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-> Foreign Scan on public.ft1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" ORDER BY c6 DESC NULLS FIRST, "C 1" ASC NULLS LAST
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(5 rows)
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SELECT * FROM ft1 ORDER BY c6 DESC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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------+-----+-----------------+------------------------------+--------------------------+----+------------+-----
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1020 | 100 | 0002000020 | | | | ft2 |
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1101 | 201 | aaa | | | | ft2 |
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1103 | 503 | ccc_update3 | | | | ft2 |
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1104 | 204 | ddd | | | | ft2 |
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1208 | 818 | fff_trig_update | | | | ft2 |
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9 | 509 | 00009_update9 | Sat Jan 10 00:00:00 1970 PST | Sat Jan 10 00:00:00 1970 | 9 | ft2 | foo
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19 | 509 | 00019_update9 | Tue Jan 20 00:00:00 1970 PST | Tue Jan 20 00:00:00 1970 | 9 | ft2 | foo
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29 | 509 | 00029_update9 | Fri Jan 30 00:00:00 1970 PST | Fri Jan 30 00:00:00 1970 | 9 | ft2 | foo
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39 | 509 | 00039_update9 | Mon Feb 09 00:00:00 1970 PST | Mon Feb 09 00:00:00 1970 | 9 | ft2 | foo
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49 | 509 | 00049_update9 | Thu Feb 19 00:00:00 1970 PST | Thu Feb 19 00:00:00 1970 | 9 | ft2 | foo
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(10 rows)
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-- ORDER BY ASC NULLS FIRST options
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 ORDER BY c6 ASC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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QUERY PLAN
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---------------------------------------------------------------------------------------------------------------------------------
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Limit
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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-> Foreign Scan on public.ft1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" ORDER BY c6 ASC NULLS FIRST, "C 1" ASC NULLS LAST
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(5 rows)
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SELECT * FROM ft1 ORDER BY c6 ASC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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------+-----+-------------------+------------------------------+--------------------------+------+------------+-----
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1020 | 100 | 0002000020 | | | | ft2 |
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1101 | 201 | aaa | | | | ft2 |
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1103 | 503 | ccc_update3 | | | | ft2 |
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1104 | 204 | ddd | | | | ft2 |
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1208 | 818 | fff_trig_update | | | | ft2 |
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1218 | 818 | ggg_trig_update | | | (--; | ft2 |
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10 | 42 | 00010_trig_update | Sun Jan 11 00:00:00 1970 PST | Sun Jan 11 00:00:00 1970 | 0 | 0 | foo
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20 | 42 | 00020_trig_update | Wed Jan 21 00:00:00 1970 PST | Wed Jan 21 00:00:00 1970 | 0 | 0 | foo
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30 | 42 | 00030_trig_update | Sat Jan 31 00:00:00 1970 PST | Sat Jan 31 00:00:00 1970 | 0 | 0 | foo
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40 | 42 | 00040_trig_update | Tue Feb 10 00:00:00 1970 PST | Tue Feb 10 00:00:00 1970 | 0 | 0 | foo
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(10 rows)
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-- ===================================================================
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-- test check constraints
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-- ===================================================================
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@ -4630,8 +4710,8 @@ analyze loct1;
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-- inner join; expressions in the clauses appear in the equivalence class list
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explain (verbose, costs off)
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select foo.f1, loct1.f1 from foo join loct1 on (foo.f1 = loct1.f1) order by foo.f2 offset 10 limit 10;
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QUERY PLAN
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---------------------------------------------------------------------------------------
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QUERY PLAN
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--------------------------------------------------------------------------------------------------
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Limit
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Output: foo.f1, loct1.f1, foo.f2
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-> Sort
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@ -4646,7 +4726,7 @@ explain (verbose, costs off)
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Output: foo.f1, foo.f2
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-> Foreign Scan on public.foo2
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Output: foo2.f1, foo2.f2
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Remote SQL: SELECT f1, f2 FROM public.loct1 ORDER BY f1 ASC
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Remote SQL: SELECT f1, f2 FROM public.loct1 ORDER BY f1 ASC NULLS LAST
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-> Index Only Scan using i_loct1_f1 on public.loct1
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Output: loct1.f1
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(17 rows)
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@ -4670,8 +4750,8 @@ select foo.f1, loct1.f1 from foo join loct1 on (foo.f1 = loct1.f1) order by foo.
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-- list but no output change as compared to the previous query
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explain (verbose, costs off)
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select foo.f1, loct1.f1 from foo left join loct1 on (foo.f1 = loct1.f1) order by foo.f2 offset 10 limit 10;
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QUERY PLAN
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---------------------------------------------------------------------------------------
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QUERY PLAN
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--------------------------------------------------------------------------------------------------
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Limit
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Output: foo.f1, loct1.f1, foo.f2
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-> Sort
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@ -4686,7 +4766,7 @@ explain (verbose, costs off)
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Output: foo.f1, foo.f2
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-> Foreign Scan on public.foo2
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Output: foo2.f1, foo2.f2
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Remote SQL: SELECT f1, f2 FROM public.loct1 ORDER BY f1 ASC
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Remote SQL: SELECT f1, f2 FROM public.loct1 ORDER BY f1 ASC NULLS LAST
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-> Index Only Scan using i_loct1_f1 on public.loct1
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Output: loct1.f1
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(17 rows)
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@ -677,6 +677,18 @@ commit;
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select c2, count(*) from ft2 where c2 < 500 group by 1 order by 1;
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select c2, count(*) from "S 1"."T 1" where c2 < 500 group by 1 order by 1;
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-- Above DMLs add data with c6 as NULL in ft1, so test ORDER BY NULLS LAST and NULLs
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-- FIRST behavior here.
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-- ORDER BY DESC NULLS LAST options
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 ORDER BY c6 DESC NULLS LAST, c1 OFFSET 795 LIMIT 10;
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SELECT * FROM ft1 ORDER BY c6 DESC NULLS LAST, c1 OFFSET 795 LIMIT 10;
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-- ORDER BY DESC NULLS FIRST options
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 ORDER BY c6 DESC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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SELECT * FROM ft1 ORDER BY c6 DESC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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-- ORDER BY ASC NULLS FIRST options
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 ORDER BY c6 ASC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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SELECT * FROM ft1 ORDER BY c6 ASC NULLS FIRST, c1 OFFSET 15 LIMIT 10;
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-- ===================================================================
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-- test check constraints
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-- ===================================================================
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