leventov commented on a change in pull request #5958: Part 2 of changes for SQL 
Compatible Null Handling
URL: https://github.com/apache/incubator-druid/pull/5958#discussion_r202522841
 
 

 ##########
 File path: sql/src/main/java/io/druid/sql/calcite/planner/Calcites.java
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 @@ -107,6 +108,7 @@ public static SchemaPlus createRootSchema(final Schema 
druidSchema, final Author
 
   public static String escapeStringLiteral(final String s)
   {
+    Preconditions.checkNotNull(s);
     if (s == null) {
 
 Review comment:
   This check immediately after Preconditions.checkNotNull?

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