NobiGo commented on code in PR #3863:
URL: https://github.com/apache/calcite/pull/3863#discussion_r1687712138


##########
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java:
##########
@@ -7700,6 +7700,27 @@ private void checkLiteral2(String expression, String 
expected) {
         .withOracle(11).throws_("Lower Oracle version(<12) doesn't support 
offset/fetch syntax!");
   }
 
+  /** Test case for
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-6482";>[CALCITE-6482]
+   * Oracle dialect convert bool literal when version < 23</a>.*/

Review Comment:
   The Doc comment should stay the same as the JIRA summary. And we try not to 
use abbreviations as much as possible.



##########
core/src/main/java/org/apache/calcite/sql/SqlDialect.java:
##########
@@ -466,6 +466,13 @@ public void unparseCall(SqlWriter writer, SqlCall call, 
int leftPrec,
     }
   }
 
+  public void unparseBoolLiteral(SqlWriter writer,
+      SqlLiteral literal, int leftPrec, int rightPrec) {
+    Object value = literal.getValue();
+    writer.keyword(
+        !(value instanceof Boolean) ? "UNKNOWN" : (Boolean) value ? "TRUE" : 
"FALSE");

Review Comment:
   Why do we use `value instanceof Boolean`, not the `value == null`?CASE 
condition has done the same thing, so I think `value == null` is clearer to me.



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