Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/819#discussion_r113801030
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillOptiq.java
---
@@ -599,10 +598,28 @@ public LogicalExpression visitLiteral(RexLiteral
literal) {
throw new UnsupportedOperationException(String.format("Unable to
convert the value of %s and type %s to a Drill constant expression.", literal,
literal.getType().getSqlTypeName()));
}
}
- }
- private static final TypedNullConstant createNullExpr(MinorType type) {
- return new TypedNullConstant(Types.optional(type));
+ /**
+ * Create nullable major type using given minor type
+ * and wraps it in typed null constant.
+ *
+ * @param type minor type
+ * @return typed null constant instance
+ */
+ private TypedNullConstant createNullExpr(MinorType type) {
+ return new TypedNullConstant(Types.optional(type));
+ }
+
+ /**
+ * Create nullable varchar major type with given precision
+ * and wraps it in typed null constant.
+ *
+ * @param precision precision value
+ * @return typed null constant instance
+ */
+ private TypedNullConstant createStringNullExpr(int precision) {
+ return new TypedNullConstant(Types.withPrecision(MinorType.VARCHAR,
TypeProtos.DataMode.OPTIONAL, precision));
--- End diff --
What's the length for "NULL" varchar constant?
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