sunxiaoguang commented on code in PR #49335:
URL: https://github.com/apache/spark/pull/49335#discussion_r1910368126
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sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala:
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@@ -112,6 +151,19 @@ private case class MySQLDialect() extends JdbcDialect with
SQLConfHelper with No
} else {
super.visitAggregateFunction(funcName, isDistinct, inputs)
}
+
+ override def visitCast(expr: String, exprDataType: DataType, dataType:
DataType): String = {
+ val databaseTypeDefinition = dataType match {
+ // MySQL uses CHAR in the cast function for the type LONGTEXT
+ case StringType => "CHAR"
Review Comment:
Right, MySQL uses different type identifier in cast function for certain
types.
Here is a list of types can be used for different data types in cast function
https://dev.mysql.com/doc/refman/8.4/en/cast-functions.html
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