sunxiaoguang commented on code in PR #49453:
URL: https://github.com/apache/spark/pull/49453#discussion_r1916265920
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sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala:
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@@ -112,6 +112,21 @@ 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"
+ // MySQL uses SIGNED INTEGER in the cast function for SMALLINT,
INTEGER and BIGINT.
+ // To avoid breaking code relying on ResultSet metadata, we support
BIGINT only at
+ // this time.
+ case LongType => "SIGNED INTEGER"
+ // MySQL uses BINARY in the cast function for the type BLOB
+ case BinaryType => "BINARY"
+ case _ =>
getJDBCType(dataType).map(_.databaseTypeDefinition).getOrElse(dataType.typeName)
Review Comment:
Sure, I saw other dialects are using both predefined functions in
QueryExecutionErrors and classifyException with structured metadata. I'm trying
to use QueryExecutionErrors.notSupportTypeError here, not sure if it's
appropriate. If not, please let me know and I will try changing it to
classifyException instead. PTAL
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