diff --git a/pkg/planner/core/rule_predicate_simplification.go b/pkg/planner/core/rule_predicate_simplification.go
index dde7dd725fdd5..3ab9bec94b266 100644
--- a/pkg/planner/core/rule_predicate_simplification.go
+++ b/pkg/planner/core/rule_predicate_simplification.go
@@ -55,6 +55,9 @@ func findPredicateType(expr expression.Expression) (*expression.Column, predicat
 			return nil, orPredicate
 		}
 		args := v.GetArgs()
+		if len(args) == 0 {
+			return nil, otherPredicate
+		}
 		col, colOk := args[0].(*expression.Column)
 		if !colOk {
 			return nil, otherPredicate
diff --git a/tests/integrationtest/r/planner/core/issuetest/planner_issue.result b/tests/integrationtest/r/planner/core/issuetest/planner_issue.result
index db2849b3767fb..fae189720819b 100644
--- a/tests/integrationtest/r/planner/core/issuetest/planner_issue.result
+++ b/tests/integrationtest/r/planner/core/issuetest/planner_issue.result
@@ -750,6 +750,7 @@ NULL	NULL	2	2	4	2
 show warnings;
 Level	Code	Message
 drop table if exists t1, t2, t3, t4;
+<<<<<<< HEAD
 drop table if exists tl6e913fb9;
 CREATE TABLE `tl6e913fb9` (
 `col_36` varchar(175) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'asMF',
@@ -759,3 +760,11 @@ KEY `idx_65` (`col_36`(5))
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 with cte_192 ( col_1101,col_1102,col_1103,col_1104 ) AS ( select  /*+ use_index_merge( tl6e913fb9 ) */   replace( tl6e913fb9.col_36 , tl6e913fb9.col_36 , tl6e913fb9.col_36 ) as r0 , space( 0 ) as r1 , min( distinct  tl6e913fb9.col_36 ) as r2 , count( distinct  tl6e913fb9.col_36 ) as r3 from tl6e913fb9 where tl6e913fb9.col_36 between 'n92ok$B%W#UU%O' and '()c=KVQ=T%-vzGJ' and tl6e913fb9.col_36 in ( 'T+kf' ,'Lvluod2H' ,'3#Omx@pC^fFkeH' ,'=b$z' ) group by tl6e913fb9.col_36  having tl6e913fb9.col_36 = 'xjV@' or IsNull( tl6e913fb9.col_36 ) ) ( select 1,col_1101,col_1102,col_1103,col_1104 from cte_192 where not( IsNull( cte_192.col_1102 ) ) order by 1,2,3,4,5 limit 72850972 );
 1	col_1101	col_1102	col_1103	col_1104
+=======
+drop table if exists t0, v0;
+drop view if exists v0;
+CREATE  TABLE  t0(c0 INTEGER);
+CREATE VIEW v0(c0) AS SELECT 'a' FROM t0 WHERE (CASE t0.c0 WHEN t0.c0 THEN false END );
+SELECT t0.c0 FROM v0, t0 WHERE RAND();
+c0
+>>>>>>> ed2d749bc1f (planner: Fix predicate simplification panic caused by zero-argument expressions like rand() (#56947))
diff --git a/tests/integrationtest/t/planner/core/issuetest/planner_issue.test b/tests/integrationtest/t/planner/core/issuetest/planner_issue.test
index b1802c7089860..72a8da7fd5ae7 100644
--- a/tests/integrationtest/t/planner/core/issuetest/planner_issue.test
+++ b/tests/integrationtest/t/planner/core/issuetest/planner_issue.test
@@ -518,6 +518,7 @@ SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
 show warnings;
 drop table if exists t1, t2, t3, t4;
 
+<<<<<<< HEAD
 # TestIssue56479
 drop table if exists tl6e913fb9;
 CREATE TABLE `tl6e913fb9` (
@@ -526,4 +527,12 @@ CREATE TABLE `tl6e913fb9` (
   PRIMARY KEY (`col_36`) /*T![clustered_index] NONCLUSTERED */,
   KEY `idx_65` (`col_36`(5))
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
-with cte_192 ( col_1101,col_1102,col_1103,col_1104 ) AS ( select  /*+ use_index_merge( tl6e913fb9 ) */   replace( tl6e913fb9.col_36 , tl6e913fb9.col_36 , tl6e913fb9.col_36 ) as r0 , space( 0 ) as r1 , min( distinct  tl6e913fb9.col_36 ) as r2 , count( distinct  tl6e913fb9.col_36 ) as r3 from tl6e913fb9 where tl6e913fb9.col_36 between 'n92ok$B%W#UU%O' and '()c=KVQ=T%-vzGJ' and tl6e913fb9.col_36 in ( 'T+kf' ,'Lvluod2H' ,'3#Omx@pC^fFkeH' ,'=b$z' ) group by tl6e913fb9.col_36  having tl6e913fb9.col_36 = 'xjV@' or IsNull( tl6e913fb9.col_36 ) ) ( select 1,col_1101,col_1102,col_1103,col_1104 from cte_192 where not( IsNull( cte_192.col_1102 ) ) order by 1,2,3,4,5 limit 72850972 );
\ No newline at end of file
+with cte_192 ( col_1101,col_1102,col_1103,col_1104 ) AS ( select  /*+ use_index_merge( tl6e913fb9 ) */   replace( tl6e913fb9.col_36 , tl6e913fb9.col_36 , tl6e913fb9.col_36 ) as r0 , space( 0 ) as r1 , min( distinct  tl6e913fb9.col_36 ) as r2 , count( distinct  tl6e913fb9.col_36 ) as r3 from tl6e913fb9 where tl6e913fb9.col_36 between 'n92ok$B%W#UU%O' and '()c=KVQ=T%-vzGJ' and tl6e913fb9.col_36 in ( 'T+kf' ,'Lvluod2H' ,'3#Omx@pC^fFkeH' ,'=b$z' ) group by tl6e913fb9.col_36  having tl6e913fb9.col_36 = 'xjV@' or IsNull( tl6e913fb9.col_36 ) ) ( select 1,col_1101,col_1102,col_1103,col_1104 from cte_192 where not( IsNull( cte_192.col_1102 ) ) order by 1,2,3,4,5 limit 72850972 );
+=======
+# TestIssue56270
+drop table if exists t0, v0;
+drop view if exists v0;
+CREATE  TABLE  t0(c0 INTEGER);
+CREATE VIEW v0(c0) AS SELECT 'a' FROM t0 WHERE (CASE t0.c0 WHEN t0.c0 THEN false END );
+SELECT t0.c0 FROM v0, t0 WHERE RAND();
+>>>>>>> ed2d749bc1f (planner: Fix predicate simplification panic caused by zero-argument expressions like rand() (#56947))