sunjincheng121 commented on a change in pull request #8057:
[FLINK-12028][table] Add `addColumns`,`renameColumns`, `dropColumns` …
URL: https://github.com/apache/flink/pull/8057#discussion_r269873295
##########
File path:
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/api/tableImpl.scala
##########
@@ -451,6 +450,117 @@ class TableImpl(
}
tableName
}
+
+ override def addColumns(fields: String): Table = {
+ addColumns(ExpressionParser.parseExpressionList(fields): _*);
+ }
+
+ override def addColumns(fields: Expression*): Table = {
+ addColumns(false, fields: _*)
+ }
+
+ override def addColumns(replaceIfExist: Boolean, fields: String): Table = {
+ addColumns(replaceIfExist, ExpressionParser.parseExpressionList(fields):
_*)
+ }
+
+ override def addColumns(replaceIfExist: Boolean, fields: Expression*): Table
= {
+
+ val aggNames = extractAggregationsAndProperties(
+ fields.map(expressionBridge.bridge), tableEnv)._1
+
+ if(aggNames.nonEmpty){
+ throw new TableException(
+ s"The added field expression cannot be an aggregations, find
[${aggNames.head}].")
+ }
+
+ val childFields = logicalPlan.output.map(a =>
UnresolvedFieldReference(a.name))
+
+ if (replaceIfExist) {
+
+ val finalFields = new ListBuffer[Expression]()
+ val addFields = fields.map(expressionBridge.bridge)
+ childFields.foreach(e => finalFields.append(e))
+
+ // replace field if exist.
+ addFields.foreach {
+ case e@Alias(_, name, _) =>
+ val index = finalFields.indexWhere(p => p match {
+ case u: UnresolvedFieldReference => u.name.equalsIgnoreCase(name)
+ case a: Alias => a.name.equalsIgnoreCase(name)
+ case _ => false
+ })
+ if (index >= 0) {
+ finalFields(index) = e
Review comment:
I think is better to overwrite the field which has the same name. what do
you think?
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