[GitHub] [incubator-kyuubi] waywtdcc commented on a diff in pull request #3718: [KYUUBI #3717] Support flink engine see primary keys

[GitBox <gi...@apache.org>]

waywtdcc commented on code in PR #3718:
URL: https://github.com/apache/incubator-kyuubi/pull/3718#discussion_r1009062230


##########
externals/kyuubi-flink-sql-engine/src/main/scala/org/apache/kyuubi/engine/flink/operation/GetPrimaryKeys.scala:
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@@ -0,0 +1,103 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kyuubi.engine.flink.operation
+
+import java.util.Collections
+
+import scala.collection.JavaConverters._
+
+import org.apache.commons.lang3.StringUtils
+import org.apache.flink.table.api.{DataTypes, ResultKind}
+import org.apache.flink.table.api.bridge.java.internal.StreamTableEnvironmentImpl
+import org.apache.flink.table.catalog.{Column, UniqueConstraint}
+import org.apache.flink.types.Row
+
+import org.apache.kyuubi.engine.flink.result.ResultSet
+import org.apache.kyuubi.operation.meta.ResultSetSchemaConstant._
+import org.apache.kyuubi.session.Session
+
+class GetPrimaryKeys(
+    session: Session,
+    catalogNameOrEmpty: String,
+    schemaNameOrEmpty: String,
+    tableName: String)
+  extends FlinkOperation(session) {
+
+  override protected def runInternal(): Unit = {
+    try {
+      val tableEnv = sessionContext.getExecutionContext.getTableEnvironment
+
+      val catalogName =
+        if (StringUtils.isEmpty(catalogNameOrEmpty)) tableEnv.getCurrentCatalog
+        else catalogNameOrEmpty
+      val catalog = tableEnv.getCatalog(catalogName).get()
+
+      val schemaName =
+        if (StringUtils.isEmpty(schemaNameOrEmpty)) catalog.getDefaultDatabase
+        else schemaNameOrEmpty
+
+      val flinkTable = tableEnv.from(s"`$catalogName`.`$schemaName`.`$tableName`")
+
+      val resolvedSchema = flinkTable.getResolvedSchema
+      val uniqueConstraint = resolvedSchema.getPrimaryKey.orElse(
+        UniqueConstraint.primaryKey("null_pri", Collections.emptyList()))

Review Comment:
   Thanks for your reviews. I have modified it



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