sunxiaoguang commented on code in PR #49453:
URL: https://github.com/apache/spark/pull/49453#discussion_r1919476668
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sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala:
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@@ -112,6 +112,23 @@ 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"
+ case ShortType | IntegerType =>
+
QueryExecutionErrors.unsupportedJdbcTypeError(dataType.catalogString)
Review Comment:
Sure, let me add a test for these cases.
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