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| author | Evgeny Potemkin <epotemkin@mysql.com> | 2010-08-14 13:11:33 +0400 |
|---|---|---|
| committer | Evgeny Potemkin <epotemkin@mysql.com> | 2010-08-14 13:11:33 +0400 |
| commit | 48738f737ade6e5e58e37bcd7e70ad5a515f0f18 (patch) | |
| tree | e62f523aa32ed6704ce025ceef21724a2e6c29a3 /sql/item.cc | |
| parent | 87f655d52d4e30392f2232b51a7658684db6c5d1 (diff) | |
| download | mariadb-git-48738f737ade6e5e58e37bcd7e70ad5a515f0f18.tar.gz | |
Bug#49746: Const expression caching led to NDB not using engine condition
pushdown.
NDB supports only a limited set of item nodes for use in engine condition
pushdown. Because of this adding cache for const expression effectively
disabled this optimization.
The ndb_serialize_cond function is extended to support Item_cache and treat
it as a constant values.
A helper function called ndb_serialize_const is added. It is used to create
Ndb_cond value node from given const item.
Diffstat (limited to 'sql/item.cc')
| -rw-r--r-- | sql/item.cc | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sql/item.cc b/sql/item.cc index 1decb5ec426..24f57342668 100644 --- a/sql/item.cc +++ b/sql/item.cc @@ -5931,7 +5931,8 @@ bool Item::cache_const_expr_analyzer(uchar **arg) a subselect (they use their own cache). */ if (const_item() && - !(item->basic_const_item() || item->type() == Item::FIELD_ITEM || + !(basic_const_item() || item->basic_const_item() || + item->type() == Item::FIELD_ITEM || item->type() == SUBSELECT_ITEM || /* Do not cache GET_USER_VAR() function as its const_item() may |