Issue

• TOSTRING no longer pushed down to couchbase in comparison of double
• For a query:

SELECT BQT1.SmallA.StringKey, BQT2.SmallB.DoubleNum FROM BQT1.SmallA, BQT2.SmallB WHERE BQT1.SmallA.StringKey = convert(BQT2.SmallB.DoubleNum, string) AND BQT1.SmallA.IntKey >= 0 AND BQT2.SmallB.IntKey >= 0

The following SOURCE queries were pushed in 6.4.1:

SELECT `$cb_c1_IntKey` c_0, `$cb_c2_StringKey` c_1 FROM `dvqe_small` `$cb_t1` LET `$cb_c1_IntKey` = `$cb_t1`.`IntKey`, `$cb_c2_StringKey` = `$cb_t1`.`StringKey` WHERE `$cb_t1`.`type` = 'SmallA' ORDER BY c_1

SELECT `$cb_c1_IntKey` c_0, `$cb_c2_DoubleNum` c_1, TOSTRING(`$cb_c2_DoubleNum`) c_2 FROM `dvqe_small` `$cb_t1` LET `$cb_c1_IntKey` = `$cb_t1`.`IntKey`, `$cb_c2_DoubleNum` = `$cb_t1`.`DoubleNum` WHERE `$cb_t1`.`type` = 'SmallB' ORDER BY c_2

6.4.2 the following SOURCE query is pushed:

SELECT `$cb_c1_IntKey` c1, `$cb_c2_StringKey` c2 FROM `dvqe_small` `$cb_t1` LET `$cb_c1_IntKey` = `$cb_t1`.`IntKey`, `$cb_c2_StringKey` = `$cb_t1`.`StringKey` WHERE `$cb_t1`.`type` = 'SmallA'

SELECT `$cb_c1_IntKey` c1, `$cb_c2_DoubleNum` c2 FROM `dvqe_small` `$cb_t1` LET `$cb_c1_IntKey` = `$cb_t1`.`IntKey`, `$cb_c2_DoubleNum` = `$cb_t1`.`DoubleNum` WHERE `$cb_t1`.`type` = 'SmallB'