allisonwang-db commented on code in PR #41316:
URL: https://github.com/apache/spark/pull/41316#discussion_r1227292442
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/python/UserDefinedPythonFunction.scala:
##########
@@ -55,3 +56,36 @@ case class UserDefinedPythonFunction(
}
}
}
+
+/**
+ * A user-defined Python table function. This is used by the Python API.
+ */
+case class UserDefinedPythonTableFunction(
+ name: String,
+ func: PythonFunction,
+ returnType: StructType,
+ udfDeterministic: Boolean) {
+
+ def builder(e: Seq[Expression]): LogicalPlan = {
+ val udtf = PythonUDTF(
+ name = name,
+ func = func,
+ elementSchema = returnType,
+ children = e,
+ udfDeterministic = udfDeterministic)
+ Generate(
+ udtf,
+ unrequiredChildIndex = Nil,
+ outer = false,
+ qualifier = None,
+ generatorOutput = Nil,
+ child = OneRowRelation()
Review Comment:
The child will always be one row relation, but the UDTF can be used together
with LATERAL join, which will be optimized during logical planning:
```
LateralJoin
+- LocalRelation
+- Generate [UDTF]
+- OneRowRelation
```
to
```
Generate [UDTF]
+- LocalRelation
```
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