jayzhan211 commented on code in PR #9069:
URL: https://github.com/apache/arrow-datafusion/pull/9069#discussion_r1475328551
##########
datafusion/sql/src/expr/function.rs:
##########
@@ -70,6 +70,50 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
return Ok(Expr::ScalarFunction(ScalarFunction::new_udf(fm, args)));
}
+ // Build Unnest expression
+ if name.eq("unnest") {
+ let exprs =
+ self.function_args_to_expr(args.clone(), schema,
planner_context)?;
+
+ match exprs.len() {
+ 0 => {
+ return exec_err!("unnest() requires at least one
argument");
+ }
+ 1 => {
+ if let Expr::ScalarFunction(ScalarFunction {
+ func_def:
+ ScalarFunctionDefinition::BuiltIn(
+ BuiltinScalarFunction::MakeArray,
+ ),
+ ..
+ }) = exprs[0]
+ {
+ // valid
+ } else if let Expr::Column(_) = exprs[0] {
+ // valid
+ } else if let Expr::ScalarFunction(ScalarFunction {
+ func_def:
+
ScalarFunctionDefinition::BuiltIn(BuiltinScalarFunction::Struct),
+ ..
+ }) = exprs[0]
+ {
+ return not_impl_err!("unnest() does not support struct
yet");
+ } else {
+ return plan_err!(
+ "unnest() can only be applied to array and structs
and null"
Review Comment:
first line is struct nyi error.
second line is to tell you that only those 3 are valid.
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