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Commit5fd61bd

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Fix failure to detect some cases of improperly-nested aggregates.
check_agg_arguments_walker() supposed that it needn't descend intothe arguments of a lower-level aggregate function, but this isjust wrong in the presence of multiple levels of sub-select. Theoversight would lead to executor failures on queries that shouldbe rejected. (Prior to v11, they actually were rejected, thanksto a "redundant" execution-time check.)Per bug #17835 from Anban Company. Back-patch to all supportedbranches.Discussion:https://postgr.es/m/17835-4f29f3098b2d0ba4@postgresql.org
1 parentda6257e commit5fd61bd

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3 files changed

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‎src/backend/parser/parse_agg.c

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -735,8 +735,7 @@ check_agg_arguments_walker(Node *node,
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context->min_agglevel>agglevelsup)
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context->min_agglevel=agglevelsup;
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}
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/* no need to examine args of the inner aggregate */
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return false;
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/* Continue and descend into subtree */
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}
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if (IsA(node,GroupingFunc))
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{

‎src/test/regress/expected/aggregates.out

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1258,6 +1258,12 @@ select (select max(min(unique1)) from int8_tbl) from tenk1;
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ERROR: aggregate function calls cannot be nested
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LINE 1: select (select max(min(unique1)) from int8_tbl) from tenk1;
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^
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select avg((select avg(a1.col1 order by (select avg(a2.col2) from tenk1 a3))
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from tenk1 a1(col1)))
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from tenk1 a2(col2);
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ERROR: aggregate function calls cannot be nested
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LINE 1: select avg((select avg(a1.col1 order by (select avg(a2.col2)...
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^
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--
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-- Test removal of redundant GROUP BY columns
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--

‎src/test/regress/sql/aggregates.sql

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Original file line numberDiff line numberDiff line change
@@ -434,6 +434,9 @@ drop table minmaxtest cascade;
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-- check for correct detection of nested-aggregate errors
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selectmax(min(unique1))from tenk1;
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select (selectmax(min(unique1))from int8_tbl)from tenk1;
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selectavg((selectavg(a1.col1order by (selectavg(a2.col2)from tenk1 a3))
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from tenk1 a1(col1)))
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from tenk1 a2(col2);
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--
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-- Test removal of redundant GROUP BY columns

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