iffyio commented on code in PR #1971:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1971#discussion_r2229289934


##########
tests/sqlparser_bigquery.rs:
##########
@@ -2566,3 +2566,101 @@ fn test_struct_trailing_and_nested_bracket() {
         )
     );
 }
+
+#[test]
+fn test_datetime_granularity() {
+    let stmt = bigquery().verified_stmt(concat!(
+        "SELECT ",
+        "DATE_TRUNC(CURRENT_DATE, DAY), ",
+        "DATE_TRUNC(CURRENT_DATE, WEEK(MONDAY)) ",
+        "FROM my_table",
+    ));

Review Comment:
   Ah I see, I think the current behavior of having it parsed as a function is 
preferable since the construct is syntatically a function -  there's quite a 
lot of such special scenarios across dialects and it would likely be unwieldy 
to cover them consistently and I think out of scope for the parser as well



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