beliefer commented on code in PR #49453:
URL: https://github.com/apache/spark/pull/49453#discussion_r1929523429
##########
connector/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/v2/MySQLIntegrationSuite.scala:
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@@ -241,6 +241,61 @@ class MySQLIntegrationSuite extends
DockerJDBCIntegrationV2Suite with V2JDBCTest
assert(rows10(0).getString(0) === "amy")
assert(rows10(1).getString(0) === "alex")
}
+
+ test("SPARK-50793: MySQL JDBC Connector failed to cast some types") {
+ val tableName = catalogName + ".test_cast_function"
+ withTable(tableName) {
+ val stringValue = "0"
+ val stringLiteral = "'0'"
+ val longValue = 0L
+ val binaryValue = Array[Byte](0x30)
+ val binaryLiteral = "x'30'"
+ val doubleValue = 0.0
+ val doubleLiteral = "0.0"
+ // CREATE table to use types defined in Spark SQL
+ sql(
+ s"CREATE TABLE $tableName (string_col STRING, long_col LONG, " +
+ "binary_col BINARY, double_col DOUBLE)")
+ sql(
+ s"INSERT INTO $tableName VALUES($stringLiteral, $longValue,
$binaryLiteral, $doubleValue)")
+
+ def testCast(
+ castType: String,
+ sourceCol: String,
+ targetCol: String,
+ targetDataType: DataType,
+ targetValue: Any): Unit = {
+ val sql = s"SELECT CAST($sourceCol AS $castType) AS target " +
+ s"FROM $tableName WHERE CAST($sourceCol AS $castType) = $targetCol"
+ val df = spark.sql(sql)
+ castType match {
+ case "SHORT" | "INTEGER" =>
+ checkError(
+ exception = intercept[SparkException] {
+ df.collect()
+ },
+ condition = null)
+ case _ =>
+ checkFilterPushed(df)
+ checkAnswer(df, Seq(Row(targetValue)))
+ val expectedTypes = Array(targetDataType)
+ val resultTypes = df.schema.fields.map(_.dataType)
+ assert(resultTypes === expectedTypes, s"Failed to cast $sourceCol
to $castType")
+ }
+ }
+
+ testCast("BINARY", "string_col", "binary_col", BinaryType, binaryValue);
+ testCast("SHORT", "string_col", "long_col", LongType, longValue)
+ testCast("INTEGER", "string_col", "long_col", LongType, longValue)
+ testCast("LONG", "string_col", "long_col", LongType, longValue)
+ // We use stringLiteral to make sure both values are using the same
collation
+ testCast("STRING", "long_col", stringLiteral, StringType, stringValue)
Review Comment:
Why not use `string_col` as target column, but string literal ?
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