chunweilei commented on a change in pull request #2092:
URL: https://github.com/apache/calcite/pull/2092#discussion_r464979974
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File path: core/src/main/java/org/apache/calcite/sql/SqlUtil.java
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@@ -1189,4 +1189,19 @@ private void visitChild(SqlNode node) {
return check(type);
}
}
+
+ /**
+ * Whether the selectItem is a table function node in the select.
+ * eg. "select table_func(1) as (f0,f1)"
+ *
+ * @param selectItem select item
+ * @return true if this selectItem is a table function call
+ */
+ public static boolean isTableFunctionInSelect(SqlNode selectItem) {
+ if (selectItem.getKind() == SqlKind.AS) {
+ SqlBasicCall call = (SqlBasicCall) selectItem;
Review comment:
If the second of the `AS` is a `SqlNodeList`, it implies the call is a
`UDTF`. Otherwise, it will throw exception in the next step.
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