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[Feature] Support show view from table #5812

Description

@xy720

Support show view from table:

Syntax:

SHOW VIEW { FROM | IN } table [ FROM db ]

Example:

show view from testDb.test1
show view from test1 from testDb

Result:

+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| View | Create View |
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| test1_view | CREATE VIEW `test1_view_1` AS SELECT `a` AS `a` FROM `default_cluster:testDb`.`test1`; |
| t1_t2_view | CREATE VIEW `t1_t2_view` AS SELECT `test1`.`a` AS `a`, `test1`.`b` AS `b` FROM `default_cluster:canal_test`.`test1` LEFT OUTER JOIN `default_cluster:testDb`.`test2` ON `test1`.`a` = `test2`.`a`; |
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

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