fix bug (#4780)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Co-authored-by: fengttt <fengttt@gmail.com>

pkg/sql/plan/function/operator/coalesce.go

@@ -245,7 +245,7 @@ func coalesceString(vs []*vector.Vector, proc *process.Process, typ types.Type)
 
 			for j := 0; j < vecLen; j++ {
 				if rs.Nsp.Contains(uint64(j)) {
-					copy(dataVec[j], cols.Data)
+					dataVec[j] = append(dataVec[j], cols.Data...)
 				}
 			}
 			rs.Nsp.Np = nil

test/cases/function/func_coalesce_1.sql

@@ -17,9 +17,7 @@ select coalesce(a, 1) from t1;
 -- echo error
 select coalesce(b, 1) from t1;
 
--- @bvt:issue#4744
 select coalesce(b, '1') from t1;
--- @bvt:issue
 
 drop table t1;
 
@@ -39,11 +37,9 @@ select * from t2;
 select coalesce(a, 1.0) from t2;
 select coalesce(a, 1) from t2;
 
--- @bvt:issue#4744
 select coalesce(b, 2022-01-01) from t2;
 select coalesce(b, 2022) from t2;
 select coalesce(b, 2) from t2;
--- @bvt:issue
 
 
 select coalesce(b, '2022-10-01') from t2;
@@ -76,10 +72,8 @@ select coalesce(a, 0) from t3;
 -- echo error
 select coalesce(a, 200) from t3;
 
--- @bvt:issue#4744
 select coalesce(b, '1') from t3;
 select coalesce(b, 'bull') from t3;
--- @bvt:issue
 
 drop table t3;
 

test/result/function/func_coalesce_1.result

@@ -24,8 +24,8 @@ Can't cast column from VARCHAR type to BIGINT type because of one or more values
 select coalesce(b, '1') from t1;
 coalesce(b, 1)
 a
-
-
+1
+1
 b
 drop table t1;
 drop table if exists t2;
@@ -58,21 +58,21 @@ coalesce(a, 1)
 select coalesce(b, 2022-01-01) from t2;
 coalesce(b, 2022 - 1 - 1)
 2022-02-20 10:10:11
-
+2020
 2023-04-03 22:10:30
-
+2020
 select coalesce(b, 2022) from t2;
 coalesce(b, 2022)
 2022-02-20 10:10:11
-
+2022
 2023-04-03 22:10:30
-
+2022
 select coalesce(b, 2) from t2;
 coalesce(b, 2)
 2022-02-20 10:10:11
-
+2
 2023-04-03 22:10:30
-
+2
 select coalesce(b, '2022-10-01') from t2;
 coalesce(b, 2022-10-01)
 2022-02-20 10:10:11
@@ -128,15 +128,15 @@ coalesce(b, 1)
 a
 b
 c
-
-
+1
+1
 select coalesce(b, 'bull') from t3;
 coalesce(b, bull)
 a
 b
 c
-
-
+bull
+bull
 drop table t3;
 drop table if exists t4;
 create table t4 (f1 date, f2 datetime, f3 varchar(20));