Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/819#discussion_r113800548
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillOptiq.java
---
@@ -512,9 +511,9 @@ public LogicalExpression visitLiteral(RexLiteral
literal) {
return ValueExpressions.getBit(((Boolean) literal.getValue()));
case CHAR:
if (isLiteralNull(literal)) {
- return createNullExpr(MinorType.VARCHAR);
+ return createStringNullExpr(literal.getType().getPrecision());
--- End diff --
what is the length for literal "NULL"?
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