huaxingao commented on a change in pull request #34164:
URL: https://github.com/apache/spark/pull/34164#discussion_r721813808
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File path: sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala
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@@ -102,4 +109,59 @@ private case object MySQLDialect extends JdbcDialect {
case FloatType => Option(JdbcType("FLOAT", java.sql.Types.FLOAT))
case _ => JdbcUtils.getCommonJDBCType(dt)
}
+
+ // CREATE INDEX syntax
+ // https://dev.mysql.com/doc/refman/8.0/en/create-index.html
+ override def createIndex(
+ indexName: String,
+ indexType: String,
+ tableName: String,
+ columns: Array[NamedReference],
+ columnsProperties: Array[util.Map[NamedReference, util.Properties]],
+ properties: util.Properties): String = {
+ val columnList = columns.map(col => quoteIdentifier(col.fieldNames.head))
+ var indexProperties: String = ""
+ val scalaProps = properties.asScala
+ if (!properties.isEmpty) {
+ scalaProps.foreach { case (k, v) =>
+ indexProperties = indexProperties + " " + s"$k $v"
+ }
+ }
+
+ // columnsProperties doesn't apply to MySQL so it is ignored
+ s"CREATE $indexType INDEX ${quoteIdentifier(indexName)} ON" +
+ s" ${quoteIdentifier(tableName)}" + s" (${columnList.mkString(", ")})
$indexProperties"
+ }
+
+ // SHOW INDEX syntax
+ // https://dev.mysql.com/doc/refman/8.0/en/show-index.html
+ override def indexExists(
+ conn: Connection,
+ indexName: String,
+ tableName: String,
+ options: JDBCOptions): Boolean = {
+ val sql = s"SHOW INDEXES FROM $tableName"
+ val rs = JdbcUtils.executeQuery(conn, options, sql)
+ while(rs.next()) {
+ val retrievedIndexName = rs.getString("key_name")
+ if (conf.resolver(retrievedIndexName, indexName)) {
+ return true
+ }
+ }
+ false
+ }
+
+ override def classifyException(message: String, e: Throwable):
AnalysisException = {
+ if (e.isInstanceOf[SQLException]) {
+ // Error codes are from
+ //
https://mariadb.com/kb/en/mariadb-error-codes/#shared-mariadbmysql-error-codes
+ e.asInstanceOf[SQLException].getErrorCode match {
+ // ER_DUP_KEYNAME
+ case 1061 =>
+ throw new IndexAlreadyExistsException(message, cause = Some(e))
Review comment:
following the example here
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/jdbc/H2Dialect.scala#L30
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