From 70ca2c1b76d90ab69d5e003d218600f019fea569 Mon Sep 17 00:00:00 2001
From: HuSen8891 <husen.xjtu@gmail.com>
Date: Fri, 16 Aug 2024 14:30:31 +0800
Subject: [PATCH] Fix: support NULL input for like operations

---
 .../expr-common/src/type_coercion/binary.rs   |  1 +
 datafusion/sqllogictest/test_files/regexp.slt | 20 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/datafusion/expr-common/src/type_coercion/binary.rs b/datafusion/expr-common/src/type_coercion/binary.rs
index fd97f9af1328..6d2fb660f669 100644
--- a/datafusion/expr-common/src/type_coercion/binary.rs
+++ b/datafusion/expr-common/src/type_coercion/binary.rs
@@ -1045,6 +1045,7 @@ pub fn like_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<DataTyp
         .or_else(|| list_coercion(lhs_type, rhs_type))
         .or_else(|| binary_to_string_coercion(lhs_type, rhs_type))
         .or_else(|| dictionary_coercion(lhs_type, rhs_type, false))
+        .or_else(|| regex_null_coercion(lhs_type, rhs_type))
         .or_else(|| null_coercion(lhs_type, rhs_type))
 }
 
diff --git a/datafusion/sqllogictest/test_files/regexp.slt b/datafusion/sqllogictest/test_files/regexp.slt
index 22322d79ccfe..c04021651a50 100644
--- a/datafusion/sqllogictest/test_files/regexp.slt
+++ b/datafusion/sqllogictest/test_files/regexp.slt
@@ -395,6 +395,26 @@ SELECT 'foo\nbar\nbaz' LIKE '%bar%';
 ----
 true
 
+query B
+SELECT NULL LIKE NULL;
+----
+NULL
+
+query B
+SELECT NULL iLIKE NULL;
+----
+NULL
+
+query B
+SELECT NULL not LIKE NULL;
+----
+NULL
+
+query B
+SELECT NULL not iLIKE NULL;
+----
+NULL
+
 statement ok
 drop table t;