SQL Expressions: Add setting to limit length of query (#110165)

sql_expression_query_length_limit

Set the maximum length of a SQL query that can be used in a SQL expression. Default is 10000 characters. A setting of 0 means no limit.

pkg/expr/graph_test.go

@@ -233,7 +233,8 @@ func TestServicebuildPipeLine(t *testing.T) {
 		},
 	}
 	s := Service{
-		cfg: setting.NewCfg(),
+		cfg:    setting.NewCfg(),
+		tracer: &testTracer{},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {