[
https://issues.apache.org/jira/browse/FLINK-8038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16255272#comment-16255272
]
ASF GitHub Bot commented on FLINK-8038:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/5015#discussion_r151407535
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/map.scala
---
@@ -0,0 +1,108 @@
+/*
+ * 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.flink.table.expressions
+
+import org.apache.calcite.rex.RexNode
+import org.apache.calcite.sql.fun.SqlStdOperatorTable
+import org.apache.calcite.tools.RelBuilder
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.api.java.typeutils.{GenericTypeInfo, MapTypeInfo}
+import org.apache.flink.table.calcite.{FlinkRelBuilder, FlinkTypeFactory}
+import org.apache.flink.table.plan.schema.MapRelDataType
+import org.apache.flink.table.validate.{ValidationFailure,
ValidationResult, ValidationSuccess}
+
+import scala.collection.JavaConverters._
+
+case class MapConstructor(elements: Seq[Expression]) extends Expression {
+ override private[flink] def children: Seq[Expression] = elements
+
+ private[flink] var mapResultType: TypeInformation[_] = new MapTypeInfo(
+ new GenericTypeInfo[AnyRef](classOf[AnyRef]),
+ new GenericTypeInfo[AnyRef](classOf[AnyRef]))
+
+ override private[flink] def toRexNode(implicit relBuilder: RelBuilder):
RexNode = {
+ val typeFactory =
relBuilder.asInstanceOf[FlinkRelBuilder].getTypeFactory
+ val entryRelDataTypes = elements
+ .map(x => typeFactory.createTypeFromTypeInfo(x.resultType,
isNullable = false))
+ val relDataType = SqlStdOperatorTable
--- End diff --
You can replace this by a call to the `FlinkTypeFactory.createMapType()`.
> Support MAP value constructor
> -----------------------------
>
> Key: FLINK-8038
> URL: https://issues.apache.org/jira/browse/FLINK-8038
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Rong Rong
> Assignee: Rong Rong
>
> Similar to https://issues.apache.org/jira/browse/FLINK-4554
> We want to support Map value constructor which is supported by Calcite:
> https://calcite.apache.org/docs/reference.html#value-constructors
> {code:sql}
> SELECT
> MAP['key1', f0, 'key2', f1] AS stringKeyedMap,
> MAP['key', 'value'] AS literalMap,
> MAP[f0, f1] AS fieldMap
> FROM
> table
> {code}
> This should enable users to construct MapTypeInfo, one of the CompositeType.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
