Control Flow Functions

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TiDB supports all of the control flow functions available in MySQL 5.7.

Name	Description
`CASE`	Case operator
`IF()`	If/else construct
`IFNULL()`	Null if/else construct
`NULLIF()`	Return NULL if expr1 = expr2

Control Flow Functionswas last updated 6/6/2022, 8:02:15 AM: remove aliases for v6.1 docs (#8795)

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