allisonwang-db commented on code in PR #49471:
URL: https://github.com/apache/spark/pull/49471#discussion_r1985591167
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala:
##########
@@ -1675,6 +1676,86 @@ class SessionCatalog(
}
}
+ /**
+ * Constructs a SQL table function plan.
+ * This function should be invoked with the captured SQL configs from the
function.
+ *
+ * Example SQL table function:
+ *
+ * CREATE FUNCTION foo(x INT) RETURNS TABLE(a INT) RETURN SELECT x + 1 AS
x1
+ *
+ * Query:
+ *
+ * SELECT * FROM foo(1);
+ *
+ * Plan:
+ *
+ * Project [CAST(x1 AS INT) AS a]
+ * +- LateralJoin lateral-subquery [x]
+ * : +- Project [(outer(x) + 1) AS x1]
+ * : +- OneRowRelation
+ * +- Project [CAST(1 AS INT) AS x]
+ * +- OneRowRelation
+ */
+ def makeSQLTableFunctionPlan(
+ name: String,
+ function: SQLFunction,
+ input: Seq[Expression],
+ outputAttrs: Seq[Attribute]): LogicalPlan = {
+ assert(function.isTableFunc)
+ val funcName = function.name.funcName
+ val inputParam = function.inputParam
+ val returnParam = function.getTableFuncReturnCols
+ val (_, query) = function.getExpressionAndQuery(parser, isTableFunc = true)
+ assert(query.isDefined)
+
+ // Check function arguments
+ val paramSize = inputParam.map(_.size).getOrElse(0)
+ if (input.size > paramSize) {
+ throw QueryCompilationErrors.wrongNumArgsError(
+ name, paramSize.toString, input.size)
+ }
+
+ val body = if (inputParam.isDefined) {
+ val param = inputParam.get
+ // Attributes referencing the input parameters inside the function can
use the
+ // function name as a qualifier.
+ val qualifier = Seq(funcName)
+ val paddedInput = input ++
+ param.takeRight(paramSize - input.size).map { p =>
Review Comment:
Actually I realized the default argument is not really properly supported
(for both scalar and table functions):
```
scala> spark.sql("""create function foo(x int default 0) returns int return
x""")
org.apache.spark.sql.catalyst.parser.ParseException:
[PARSE_SYNTAX_ERROR] Syntax error at or near 'default'. SQLSTATE: 42601
```
I will create a separate PR to make this work.
[SPARK-51439](https://issues.apache.org/jira/browse/SPARK-51439)
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