[fix](delete) fix the error message for valid decimal data for 2.1

be/src/olap/utils.cpp

@@ -546,7 +546,8 @@ bool valid_decimal(const std::string& value_str, const uint32_t precision, const
     }
 
     size_t number_length = value_str.size();
-    if (value_str[0] == '-') {
+    bool is_negative = value_str[0] == '-';
+    if (is_negative) {
         --number_length;
     }
 
@@ -557,7 +558,7 @@ bool valid_decimal(const std::string& value_str, const uint32_t precision, const
         integer_len = number_length;
         fractional_len = 0;
     } else {
-        integer_len = point_pos;
+        integer_len = point_pos - (is_negative ? 1 : 0);
         fractional_len = number_length - point_pos - 1;
     }
 

regression-test/data/delete_p0/test_delete.out

@@ -145,3 +145,5 @@ ccc	ccc
 39	40	42	43	131.200	s	o	2023-02-10	2023-02-10T00:01:02	false	22236.106	nn
 43	44	46	47	135.200	g	t	2023-02-14	2023-02-14T00:01:02	false	22240.106	rr
 
+-- !check_decimal --
+true	-1.0	10

regression-test/suites/delete_p0/test_delete.groovy

@@ -512,4 +512,31 @@ suite("test_delete") {
         sql "delete from table_bitmap where user_id is null"
         exception "Can not apply delete condition to column type: BITMAP"
     }
+
+    sql "drop table if exists table_decimal"
+    sql """
+        CREATE TABLE table_decimal (
+          `k1` BOOLEAN NOT NULL,
+          `k2` DECIMAL(17, 1) NOT NULL,
+          `k3` INT NOT NULL
+        ) ENGINE=OLAP 
+        DUPLICATE KEY(`k1`,`k2`,`k3`) 
+        DISTRIBUTED BY HASH(`k1`,`k2`,`k3`) BUCKETS 4 
+        PROPERTIES (
+        "replication_num" = "1",
+        "disable_auto_compaction" = "false"
+        ); 
+    """
+    sql """
+        insert into table_decimal values
+        (false, '-9999782574499444.2', -20),
+        (true, '-1', 10);
+    """
+    sql """
+        delete from table_decimal where k1 = false and k2 = '-9999782574499444.2' and k3 = '-20';
+    """
+    qt_check_decimal """
+        select * from table_decimal;
+    """
+
 }