[GitHub] [incubator-kyuubi] pan3793 commented on a change in pull request #1891: [KYUUBI #1867] Support `PlanOnlyStatement` operation like Spark SQL engine

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pan3793 commented on a change in pull request #1891:
URL: https://github.com/apache/incubator-kyuubi/pull/1891#discussion_r805498034



##########
File path: externals/kyuubi-flink-sql-engine/src/main/scala/org/apache/kyuubi/engine/flink/operation/PlanOnlyStatement.scala
##########
@@ -0,0 +1,71 @@
+/*
+ * 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 org.apache.flink.table.api.TableEnvironment
+import org.apache.flink.table.operations.command.{ResetOperation, SetOperation}
+
+import org.apache.kyuubi.KyuubiSQLException
+import org.apache.kyuubi.config.KyuubiConf.OperationModes._
+import org.apache.kyuubi.engine.flink.result.ResultSetUtil
+import org.apache.kyuubi.operation.OperationType
+import org.apache.kyuubi.operation.log.OperationLog
+import org.apache.kyuubi.session.Session
+
+/**
+ * Perform the statement parsing, analyzing or optimizing only without executing it
+ */
+class PlanOnlyStatement(
+    session: Session,
+    override val statement: String,
+    mode: OperationMode)
+  extends FlinkOperation(OperationType.EXECUTE_STATEMENT, session) {
+
+  private val operationLog: OperationLog = OperationLog.createOperationLog(session, getHandle)
+  override def getOperationLog: Option[OperationLog] = Option(operationLog)
+
+  override protected def runInternal(): Unit = {
+    try {
+      val operation = executor.parseStatement(sessionId, statement)
+      operation match {
+        case setOperation: SetOperation =>
+          resultSet = ResultSetUtil.runSetOperation(setOperation, executor, sessionId)
+        case resetOperation: ResetOperation =>
+          resultSet = ResultSetUtil.runResetOperation(resetOperation, executor, sessionId)
+        case _ => explainOperation(statement)
+      }
+    } catch {
+      onError()
+    }
+  }
+
+  private def explainOperation(statement: String): Unit = {
+    val tableEnv: TableEnvironment = sessionContext.getExecutionContext.getTableEnvironment
+    mode match {
+      case PARSE =>
+        val sqlPlan = tableEnv.explainSql(statement)
+        resultSet =
+          ResultSetUtil.stringListToResultSet(
+            List(sqlPlan.split(System.lineSeparator()).apply(1)),
+            "plan")
+      case _ =>
+        throw KyuubiSQLException(
+          s"The operation mode ${mode.toString} doesn't support in Flink SQL engine.")

Review comment:
       Would you please give some context about Flink plan mode? i.e., which phase does Flink support at now or in future?




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