diff options
Diffstat (limited to 'src/backend/parser/parse_clause.c')
| -rw-r--r-- | src/backend/parser/parse_clause.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/backend/parser/parse_clause.c b/src/backend/parser/parse_clause.c index 654dce6755e..8d90b5098a1 100644 --- a/src/backend/parser/parse_clause.c +++ b/src/backend/parser/parse_clause.c @@ -339,10 +339,11 @@ transformJoinUsingClause(ParseState *pstate, /* * We cheat a little bit here by building an untransformed operator tree - * whose leaves are the already-transformed Vars. This is OK because - * transformExpr() won't complain about already-transformed subnodes. - * However, this does mean that we have to mark the columns as requiring - * SELECT privilege for ourselves; transformExpr() won't do it. + * whose leaves are the already-transformed Vars. This requires collusion + * from transformExpr(), which normally could be expected to complain + * about already-transformed subnodes. However, this does mean that we + * have to mark the columns as requiring SELECT privilege for ourselves; + * transformExpr() won't do it. */ forboth(lvars, leftVars, rvars, rightVars) { |