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MCOL-4282 Follow up version 2.

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Mutate the optimizer flags for prepared statements in:
  1. ha_mcs::open
  2. ha_mcs::discover_check_version

This is done to ensure the optimizer flags are disabled before
JOIN::prepare() is called during "PREPARE stmt FROM ...".
This commit is contained in:
Gagan Goel
2020-09-25 01:29:21 -04:00
parent 5646164a46
commit a1ea633a19
3 changed files with 51 additions and 2 deletions
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14
dbcon/mysql/ha_mcs.h
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@ -138,6 +138,20 @@ public:
*/
int open(const char* name, int mode, uint32_t test_if_locked); // required
// MCOL-4282 This function is called by open_tables in sql_base.cc.
// We mutate the optimizer flags here for prepared statements as this
// handler function is called before JOIN::prepare, and we need to
// disable the default optimizer flags before JOIN::prepare (which is
// called during "PREPARE stmt FROM ..." SQL) is called.
// Sequence of SQL statements that will lead to this execution path
// for prepared statements:
// CREATE TABLE t1 (a int, b int) engine=columnstore;
// INSERT INTO t1 VALUES (1, 2), (2, 4), (3, 1);
// PREPARE stmt1 FROM "SELECT * FROM t1";
// EXECUTE stmt1;
int discover_check_version() override;
/** @brief
We implement this in ha_example.cc; it's a required method.
*/