chore(ci): add fuzz decimal tests (#18176)

Author: sundy-li

tests/suites/0_stateless/19_fuzz/19_0007_fuzz_decimal.result

@@ -0,0 +1 @@
+1

tests/suites/0_stateless/19_fuzz/19_0007_fuzz_decimal.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+. "$CURDIR"/../../../shell_env.sh
+
+
+MAX_SCALE=74
+TIMES=30
+
+echo "SELECT 1 + 1" > /tmp/decimal.sql
+for scale in `seq 0 ${MAX_SCALE}`;do
+	precisions=$(shuf -i 1-$[$MAX_SCALE - scale] -n ${TIMES})
+	for precision in ${precisions};do
+		printf ", 1.1 + 2.%0${scale}d\n"
+		printf ", 1.%0${scale}d + 2.%0${scale}d\n"
+		printf ", 1%0${precision}d.%0${scale}d + 2.1\n"
+		printf ", 1%0${precision}d.%0${scale}d + 2.%0${scale}d\n"
+		printf ", 1%0${precision}d.%0${scale}d + 2%0${precision}d.%0${scale}d\n"
+	done
+done >> /tmp/decimal.sql
+
+cat /tmp/decimal.sql | $BENDSQL_CLIENT_OUTPUT_NULL
+echo "1"
+