mirror of
https://github.com/hanzoai/postgres.git
synced 2026-10-30 18:33:07 +00:00
Robert Haas
e0b37905ac
Generic tags allow sublists, e.g. MERGE_JOIN((x y)), but simple tags do not, e.g. SEQ_SCAN(x) is valid but SEQ_SCAN((x)) is not. DO_NOT_SCAN was intended to be simple tag, but was accidentally implemented as a generic one. This could result in assertion failures. Repair. Reported-by: Nikita Kalinin <[email protected]> Analyzed-by: Tender Wang <[email protected]> Analyzed-by: Ayush Tiwari <[email protected]> Discussion: http://postgr.es/m/[email protected]
89 lines
3.4 KiB
SQL
89 lines
3.4 KiB
SQL
LOAD 'pg_plan_advice';
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-- An empty string is allowed. Empty target lists are allowed for most advice
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-- tags, but not for JOIN_ORDER. "Supplied Plan Advice" should be omitted in
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-- text format when there is no actual advice, but not in non-text format.
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SET pg_plan_advice.advice = '';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'SEQ_SCAN()';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'NESTED_LOOP_PLAIN()';
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EXPLAIN (COSTS OFF, FORMAT JSON) SELECT 1;
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SET pg_plan_advice.advice = 'JOIN_ORDER()';
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-- Test assorted variations in capitalization, whitespace, and which parts of
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-- the relation identifier are included. These should all work.
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SET pg_plan_advice.advice = 'SEQ_SCAN(x)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'seq_scan(x@y)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'SEQ_scan(x#2)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'SEQ_SCAN (x/y)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = ' SEQ_SCAN ( x / y . z ) ';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'SEQ_SCAN("x"#2/"y"."z"@"t")';
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EXPLAIN (COSTS OFF) SELECT 1;
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-- Syntax errors.
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SET pg_plan_advice.advice = 'SEQUENTIAL_SCAN(x)';
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SET pg_plan_advice.advice = 'SEQ_SCAN';
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SET pg_plan_advice.advice = 'SEQ_SCAN(';
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SET pg_plan_advice.advice = 'SEQ_SCAN("';
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SET pg_plan_advice.advice = 'SEQ_SCAN("")';
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SET pg_plan_advice.advice = 'SEQ_SCAN("a"';
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SET pg_plan_advice.advice = 'SEQ_SCAN(#';
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SET pg_plan_advice.advice = '()';
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SET pg_plan_advice.advice = '123';
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-- Tags like SEQ_SCAN and NO_GATHER don't allow sublists at all; other tags,
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-- except for JOIN_ORDER, allow at most one level of sublist. Hence, these
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-- examples should error out.
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SET pg_plan_advice.advice = 'SEQ_SCAN((x))';
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SET pg_plan_advice.advice = 'DO_NOT_SCAN((x))';
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SET pg_plan_advice.advice = 'GATHER(((x)))';
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-- Legal comments.
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SET pg_plan_advice.advice = '/**/';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'HASH_JOIN(_)/***/';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = '/* comment */ HASH_JOIN(/*x*/y)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = '/* comment */ HASH_JOIN(y//*x*/z)';
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EXPLAIN (COSTS OFF) SELECT 1;
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-- Unterminated comments.
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SET pg_plan_advice.advice = '/*';
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SET pg_plan_advice.advice = 'JOIN_ORDER("fOO") /* oops';
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-- Nested comments are not supported, so the first of these is legal and
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-- the second is not.
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SET pg_plan_advice.advice = '/*/*/';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = '/*/* stuff */*/';
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-- Foreign join requires multiple relation identifiers.
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SET pg_plan_advice.advice = 'FOREIGN_JOIN(a)';
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SET pg_plan_advice.advice = 'FOREIGN_JOIN((a))';
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-- Tag keywords used as alias names work fine, because the 'identifier'
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-- nonterminal accepts all token types.
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SET pg_plan_advice.advice = 'SEQ_SCAN(hash_join)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'SEQ_SCAN(seq_scan)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'SEQ_SCAN(gather)';
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EXPLAIN (COSTS OFF) SELECT 1;
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SET pg_plan_advice.advice = 'SEQ_SCAN(join_order)';
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EXPLAIN (COSTS OFF) SELECT 1;
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-- Tag keywords used as partition names or plan names should also work,
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-- since pgpa_identifier_string() can generate these from real partition
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-- and subquery names.
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SET pg_plan_advice.advice = 'SEQ_SCAN(t/public.hash_join)';
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SET pg_plan_advice.advice = 'SEQ_SCAN(t/hash_join.foo)';
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SET pg_plan_advice.advice = 'SEQ_SCAN(t@hash_join)';
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SET pg_plan_advice.advice = 'SEQ_SCAN(t@seq_scan)';
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