From 4e0cdec7f7c77cef907350d5f029c506cba6e8ea Mon Sep 17 00:00:00 2001
From: Christian De la Hoz <christian.hoz@anixe.pl>
Date: Tue, 31 Aug 2021 20:29:46 +0200
Subject: [PATCH] null

---
 corpus/select_statement/value_expression.txt | 30 ++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/corpus/select_statement/value_expression.txt b/corpus/select_statement/value_expression.txt
index 234114f..4d51346 100644
--- a/corpus/select_statement/value_expression.txt
+++ b/corpus/select_statement/value_expression.txt
@@ -214,3 +214,33 @@ SELECT 'hello' || 'quote''s everywh''ere';
         (string)
         (other_op)
         (string)))))
+
+================================================================================
+is null, isnull, is not null, notnull
+================================================================================
+SELECT
+    foo is null,
+    foo is not null,
+    foo isnull,
+    foo notnull;
+--------------------------------------------------------------------------------
+
+(source_file
+  (select_statement
+    (select_item
+      (op_expression
+        (identifier)
+        (comparison_null)))
+    (select_item
+      (op_expression
+        (identifier)
+        (comparison_null)))
+    (select_item
+      (op_expression
+        (identifier)
+        (comparison_null)))
+    (select_item
+      (op_expression
+        (identifier)
+        (comparison_null)))))
+