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Fix bug around assignment expressions containing indirections.

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Handling of assigned-to expressions with indirection (e.g. set f1[1] =
3) was broken for ON CONFLICT DO UPDATE.  The problem was that
ParseState was consulted to determine if an INSERT-appropriate or
UPDATE-appropriate behavior should be used when transforming expressions
with indirections. When the wrong path was taken the old row was
substituted with NULL, leading to wrong results..

To fix remove p_is_update and only use p_is_insert to decide how to
transform the assignment expression, and uset p_is_insert while parsing
the on conflict statement. This isn't particularly pretty, but it's not
any worse than before.

Author: Peter Geoghegan, slightly edited by me
Discussion: CAM3SWZS8RPvA=KFxADZWw3wAHnnbxMxDzkEC6fNaFc7zSm411w@mail.gmail.com
Backpatch: 9.5, where the feature was introduced
This commit is contained in:
Andres Freund
2015-07-24 11:48:53 +02:00
parent 16c33c50e1
commit c1ca3a19df
4 changed files with 41 additions and 2 deletions
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src/include/parser/parse_node.h
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@@ -152,7 +152,6 @@ struct ParseState
bool p_hasSubLinks;
bool p_hasModifyingCTE;
bool p_is_insert;
bool p_is_update;
bool p_locked_from_parent;
Relation p_target_relation;
RangeTblEntry *p_target_rangetblentry;