Omega359 commented on code in PR #13356:
URL: https://github.com/apache/datafusion/pull/13356#discussion_r1844007495
##########
datafusion/sqllogictest/test_files/nullif.slt:
##########
@@ -97,11 +97,35 @@ SELECT NULLIF(1, 3);
----
1
-query I
+query T
SELECT NULLIF(NULL, NULL);
----
NULL
+query R
+select nullif(1, 1.2);
+----
+1
+
+query R
+select nullif(1.0, 2);
+----
+1
+
+query error DataFusion error: Error during planning: Internal error: Failed to
match any signature, errors: Error during planning: The signature expected
NativeType::String but received NativeType::Int64
+select nullif(2, 'a');
+
+
+query T
+select nullif('2', '3');
+----
+2
+
+# TODO: support numeric string
+# This query success in Postgres and DuckDB
+query error DataFusion error: Error during planning: Internal error: Failed to
match any signature, errors: Error during planning: The signature expected
NativeType::String but received NativeType::Int64
+select nullif(2, '1');
Review Comment:
To me what is important is not strictly what other systems support - those
may/could be a guide to what datafusion will support - but whether the provided
arguments to a signature can be losslessly converted to what the signature
accepts and whether it logically makes sense to do so.
I personally would rather be lenient for what is accepted and do
casting/coercion as required than to be strict and push the onus onto the user
to do that. That's just me though, I don't know if that is the general
consensus of the community. Perhaps we should file a discussion ticket with the
options and decide?
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