sunxiaoguang commented on code in PR #49453:
URL: https://github.com/apache/spark/pull/49453#discussion_r1971726586
##########
connector/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/v2/MySQLIntegrationSuite.scala:
##########
@@ -241,6 +241,84 @@ class MySQLIntegrationSuite extends
DockerJDBCIntegrationV2Suite with V2JDBCTest
assert(rows10(0).getString(0) === "amy")
assert(rows10(1).getString(0) === "alex")
}
+
+ // MySQL Connector/J uses collation 'utf8mb4_0900_ai_ci' as collation for
connection.
+ // The MySQL server 9.1.0 uses collation 'utf8mb4_0900_ai_ci' for database
by default.
+ // This method uses string colume directly as the result of cast has the
same collation.
+ def testCastStringTarget(stringLiteral: String, stringCol: String): String =
stringCol
+
+ 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 stringCol = "string_col"
+ val longValue = 0L
+ val longCol = "long_col"
+ val binaryValue = Array[Byte](0x30)
+ val binaryLiteral = "x'30'"
+ val binaryCol = "binary_col"
+ val doubleValue = 0.0
+ val doubleLiteral = "0.0"
+ val doubleCol = "double_col"
+ // CREATE table to use types defined in Spark SQL
+ sql(
+ s"CREATE TABLE $tableName ($stringCol STRING, $longCol LONG, " +
+ s"$binaryCol BINARY, $doubleCol 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)
Review Comment:
Supporting collation to JDBC connectors sounds like a large piece of work.
We need to support them on all connectors right?
How about we come up with acceptable test cases for this PR and try to work
on real collation support in connectors as a separate piece of work. For
example, let's say we just do not verify if cast works with both columns and
literals. Or use the approach we are taking right now, which fix the
collation_connection incompatibility issue between MariaDB Connector/J and
MySQL Server.
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