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https://issues.apache.org/jira/browse/FLINK-3754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280145#comment-15280145
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ASF GitHub Bot commented on FLINK-3754:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/1958#discussion_r62851933
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/expressions/call.scala
---
@@ -18,85 +18,26 @@
package org.apache.flink.api.table.expressions
import org.apache.calcite.rex.RexNode
-import org.apache.calcite.sql.SqlOperator
-import org.apache.calcite.sql.fun.SqlStdOperatorTable
import org.apache.calcite.tools.RelBuilder
+import org.apache.flink.api.table.validate.{ExprValidationResult,
ValidationFailure}
/**
* General expression for unresolved function calls. The function can be
a built-in
* scalar function or a user-defined scalar function.
*/
-case class Call(functionName: String, args: Expression*) extends
Expression {
+case class Call(functionName: String, args: Seq[Expression]) extends
Expression {
--- End diff --
The reason why I used var-args here was that it is easier to be used in the
API once custom functions are possible: `.filter(Call("MYFUNC", 'f1, 'f2))`.
But we can also find an other way later.
> Add a validation phase before construct RelNode using TableAPI
> --------------------------------------------------------------
>
> Key: FLINK-3754
> URL: https://issues.apache.org/jira/browse/FLINK-3754
> Project: Flink
> Issue Type: Improvement
> Components: Table API
> Affects Versions: 1.0.0
> Reporter: Yijie Shen
> Assignee: Yijie Shen
>
> Unlike sql string's execution, which have a separate validation phase before
> RelNode construction, Table API lacks the counterparts and the validation is
> scattered in many places.
> I suggest to add a single validation phase and detect problems as early as
> possible.
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