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/service_sql_test.go

@@ -199,4 +199,15 @@ func TestSQLServiceErrors(t *testing.T) {
 		_, err := s.BuildPipeline(t.Context(), req)
 		require.Error(t, err, "whole pipeline fails when selecting a dependency that does not exist")
 	})
+
+	t.Run("pipeline will fail if query is longer than the configured limit", func(t *testing.T) {
+		s, req := newMockQueryService(resp,
+			newABSQLQueries(`SELECT This is too long and does not need to be valid SQL`),
+		)
+		s.cfg.SQLExpressionQueryLengthLimit = 5
+		s.features = featuremgmt.WithFeatures(featuremgmt.FlagSqlExpressions)
+
+		_, err := s.BuildPipeline(t.Context(), req)
+		require.ErrorContains(t, err, "exceeded the configured limit of 5 characters")
+	})
 }