diff options
| author | Tom Lane | 2015-03-12 03:18:03 +0000 |
|---|---|---|
| committer | Tom Lane | 2015-03-12 03:18:03 +0000 |
| commit | f4abd0241de20d5d6a79b84992b9e88603d44134 (patch) | |
| tree | 7b43a57a988932798cebdf16375f4aab860c52c0 /src/include | |
| parent | b746d0c32d4fe749c8d39ccb09d8f0fb38bcc197 (diff) | |
Support flattening of empty-FROM subqueries and one-row VALUES tables.
We can't handle this in the general case due to limitations of the
planner's data representations; but we can allow it in many useful cases,
by being careful to flatten only when we are pulling a single-row subquery
up into a FROM (or, equivalently, inner JOIN) node that will still have at
least one remaining relation child. Per discussion of an example from
Kyotaro Horiguchi.
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/nodes/relation.h | 1 | ||||
| -rw-r--r-- | src/include/optimizer/prep.h | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index e6dd4e8515..334cf51976 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -244,6 +244,7 @@ typedef struct PlannerInfo * inheritance child rel */ bool hasJoinRTEs; /* true if any RTEs are RTE_JOIN kind */ bool hasLateralRTEs; /* true if any RTEs are marked LATERAL */ + bool hasDeletedRTEs; /* true if any RTE was deleted from jointree */ bool hasHavingQual; /* true if havingQual was non-null */ bool hasPseudoConstantQuals; /* true if any RestrictInfo has * pseudoconstant = true */ diff --git a/src/include/optimizer/prep.h b/src/include/optimizer/prep.h index 385f4a866a..05e46c5b78 100644 --- a/src/include/optimizer/prep.h +++ b/src/include/optimizer/prep.h @@ -23,7 +23,7 @@ */ extern void pull_up_sublinks(PlannerInfo *root); extern void inline_set_returning_functions(PlannerInfo *root); -extern Node *pull_up_subqueries(PlannerInfo *root, Node *jtnode); +extern void pull_up_subqueries(PlannerInfo *root); extern void flatten_simple_union_all(PlannerInfo *root); extern void reduce_outer_joins(PlannerInfo *root); extern Relids get_relids_in_jointree(Node *jtnode, bool include_joins); |