Github user yjshen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1958#discussion_r62855247
--- 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 --
While I was resolving `Call` into solid expressions, `FunctionCatalog` is
used and its `withChildren` method is looking up constructors to create new
`expression` as follows:
1. look up expressions take `Seq[Expression]` as argument
2. if 1 is not fulfilled, look up the constructor match exactly the number
of arguments, like the `MyFunc` example you provided.
Does this make sense?
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