ravipesala commented on a change in pull request #3238: [CARBONDATA-3397]Remove
SparkUnknown Expression to Index Server
URL: https://github.com/apache/carbondata/pull/3238#discussion_r288120567
##########
File path:
core/src/main/java/org/apache/carbondata/core/scan/filter/FilterExpressionProcessor.java
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@@ -487,4 +489,47 @@ public static boolean isScanRequired(FilterExecuter
filterExecuter, byte[][] max
return !bitSet.isEmpty();
}
}
+
+ /**
+ * Remove UnknownExpression and change to TrueExpression
+ *
+ * @param expressionTree
+ * @return expressionTree without UnknownExpression
+ */
+ public Expression removeUnknownExpression(Expression expressionTree) {
+ ExpressionType filterExpressionType =
expressionTree.getFilterExpressionType();
+ BinaryExpression currentExpression = null;
+ switch (filterExpressionType) {
+ case OR:
+ currentExpression = (BinaryExpression) expressionTree;
+ return new OrExpression(
+ removeUnknownExpression(currentExpression.getLeft()),
+ removeUnknownExpression(currentExpression.getRight())
+ );
+ case AND:
+ currentExpression = (BinaryExpression) expressionTree;
+ return new AndExpression(
+ removeUnknownExpression(currentExpression.getLeft()),
+ removeUnknownExpression(currentExpression.getRight())
+ );
+ case UNKNOWN:
+ return new TrueExpression(null);
+ default:
+ return expressionTree;
+ }
+ }
+
+ /**
+ * Change UnknownReslover to TrueExpression Reslover.
+ *
+ * @param expressionTree
+ * @param tableIdentifier
+ * @return
+ */
+ public FilterResolverIntf changeUnknownResloverToTrue(Expression
expressionTree,
Review comment:
Please remove unused `expressionTree`
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