Github user cestella commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/119#discussion_r63105345
--- Diff:
metron-platform/metron-common/src/main/java/org/apache/metron/common/query/PredicateProcessor.java
---
@@ -18,12 +18,20 @@
package org.apache.metron.common.query;
-import org.antlr.v4.runtime.*;
-import org.apache.metron.common.query.generated.*;
+import org.antlr.v4.runtime.ANTLRInputStream;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.TokenStream;
+import org.apache.metron.common.query.generated.PredicateLexer;
+import org.apache.metron.common.query.generated.PredicateParser;
+
+import static org.apache.commons.lang3.StringUtils.isEmpty;
public class PredicateProcessor {
public boolean parse(String rule, VariableResolver resolver) {
+ if (isEmpty(rule)) {
--- End diff --
Right, I wasn't worried about empty values (your case covered that); I was
worried about whitespace-only queries. In that case
`PredicateProcessor.parse(" ") != PredicateParser.parse("")`
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