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Infer functional dependency past RelabelType

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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
This commit is contained in:
Alvaro Herrera 2017-10-12 17:23:47 +02:00
parent 7cde649ab1
commit a01a3d931e
1 changed files with 8 additions and 0 deletions
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8
src/backend/statistics/dependencies.c
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@ -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;