DRILL-7774: IS NOT NULL predicate fails with NPE for the case of non-existing columns with non-deterministic expression

Author: vvysotskyi

exec/java-exec/src/main/java/org/apache/drill/exec/expr/FilterBuilder.java

@@ -304,7 +304,9 @@ private LogicalExpression handleIsFunction(FunctionHolderExpression functionHold
     }
     LogicalExpression arg = functionHolderExpression.args.get(0);
 
-    return IsPredicate.createIsPredicate(funcName, arg.accept(this, value));
+    LogicalExpression expression = arg.accept(this, value);
+
+    return expression == null ? null : IsPredicate.createIsPredicate(funcName, expression);
   }
 
   private static boolean isCompareFunction(String funcName) {

exec/java-exec/src/test/java/org/apache/drill/exec/store/parquet/TestParquetFilterPushDown.java

@@ -683,6 +683,19 @@ public void testMinTrueMaxTrue() {
     assertEquals(RowsMatch.ALL, isNotFalse.matches(re));
   }
 
+  @Test
+  public void tesNonDeterministicIsNotNullWithNonExistingColumn() throws Exception {
+    String query = "select count(*) as cnt from cp.`tpch/nation.parquet`\n" +
+        "where (case when random() = 1 then true else null end * t) is not null";
+
+    testBuilder()
+        .sqlQuery(query)
+        .unOrdered()
+        .baselineColumns("cnt")
+        .baselineValues(0L)
+        .go();
+  }
+
   @Test
   public void testParquetSingleRowGroupFilterRemoving() throws Exception {
     test("create table dfs.tmp.`singleRowGroupTable` as select * from cp.`tpch/nation.parquet`");