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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2017-10-12 17:23:47 +0200 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2017-10-12 17:23:47 +0200 |
| commit | e9ef11ac8bb2acc2d2462fc17ec3291a959589e7 (patch) | |
| tree | 3945717c789948171cd0f85d0995fe64baf54d48 /src | |
| parent | 360fd1a7b2fe779cc9e696b813b12f6a8e83b558 (diff) | |
| download | postgresql-e9ef11ac8bb2acc2d2462fc17ec3291a959589e7.tar.gz postgresql-e9ef11ac8bb2acc2d2462fc17ec3291a959589e7.zip | |
Infer functional dependency past RelabelType
Vars hidden within a RelabelType would not be detected as compatible
with some functional dependency. Repair by properly ignoring the
RelabelType.
Author: David Rowley
Reviewed-by: Tomas Vondra
Discussion: https://postgr.es/m/CAKJS1f-y-UEy=rsBXynBOgiW1fKMr_LVoYSGL9QOc36mLEC-ww@mail.gmail.com
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/statistics/dependencies.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/statistics/dependencies.c b/src/backend/statistics/dependencies.c index 2e7c0ad6ba6..9756fb83c0c 100644 --- a/src/backend/statistics/dependencies.c +++ b/src/backend/statistics/dependencies.c @@ -792,6 +792,14 @@ dependency_is_compatible_clause(Node *clause, Index relid, AttrNumber *attnum) var = (varonleft) ? linitial(expr->args) : lsecond(expr->args); + /* + * We may ignore any RelabelType node above the operand. (There won't + * be more than one, since eval_const_expressions() has been applied + * already.) + */ + if (IsA(var, RelabelType)) + var = (Var *) ((RelabelType *) var)->arg; + /* We only support plain Vars for now */ if (!IsA(var, Var)) return false; |