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MCOL-4282 Enable Select Handler for Prepared Statements

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This patch enables select handler for executing prepared
statements. Most importantly, we are now activating a
persistent arena which will allocate any new items in a
permanent MEMROOT for prepared statements and stored procedures.
Refer to JOIN::optimize_inner() for details.

In processWhere(), we now use SELECT_LEX::prep_where in case
we are executing a prepared statement, as this is where the saved
WHERE clause is stored for prepared statement processing.

In addition, we also disable derived handler for prepared
statements.
This commit is contained in:
Gagan Goel
2020-09-11 16:35:51 -04:00
parent 1a214aee1a
commit a117786027
4 changed files with 114 additions and 14 deletions
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7
dbcon/mysql/ha_mcs_execplan.cpp
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@ -6369,8 +6369,13 @@ int processWhere(SELECT_LEX &select_lex,
Item_cond* icp = 0;
bool isUpdateDelete = false;
if (join != 0)
// Flag to indicate if this is a prepared statement
bool isPS = gwi.thd->stmt_arena && gwi.thd->stmt_arena->is_stmt_execute();
if (join != 0 && !isPS)
icp = reinterpret_cast<Item_cond*>(join->conds);
else if (isPS && select_lex.prep_where)
icp = (Item_cond*)(select_lex.prep_where);
// if icp is null, try to find the where clause other where
if (!join && gwi.thd->lex->derived_tables)