fix: cast jsonb_array_length to INTEGER to match PostgreSQL's int4 return type

PostgreSQL's jsonb_array_length() returns INTEGER (int4, OID 23), not BIGINT.
The previous BIGINT cast was incorrect and caused test failures.

Changes:
- query_remapper_function.go: Changed CAST to INTEGER instead of BIGINT
- query_handler_test.go: Updated test expectations from Int8OID to Int4OID

Author: JC1738

src/server/query_handler_test.go

@@ -195,7 +195,7 @@ func TestHandleQuery(t *testing.T) {
 			},
 			"SELECT jsonb_array_length('[1, 2, 3]'::jsonb)": {
 				"description": {"jsonb_array_length"},
-				"types":       {uint32ToString(pgtype.XID8OID)},
+				"types":       {uint32ToString(pgtype.Int4OID)},
 				"values":      {"3"},
 			},
 			"SELECT jsonb_pretty('{\"key\": \"value\"}'::JSONB)": {
@@ -265,7 +265,7 @@ func TestHandleQuery(t *testing.T) {
 			},
 			"SELECT jsonb_array_length(COALESCE('[]'::jsonb, '{}'::jsonb)) AS length": {
 				"description": {"length"},
-				"types":       {uint32ToString(pgtype.Int8OID)},
+				"types":       {uint32ToString(pgtype.Int4OID)},
 				"values":      {"0"},
 			},
 			"SELECT * FROM pg_catalog.pg_stat_gssapi": {

src/server/query_remapper_function.go

@@ -42,7 +42,7 @@ func CreatePgCatalogMacroQueries(config *Config) []string {
 			ELSE json_extract_path_text(from_json, path_elems)::varchar
 		END`,
 		`CREATE MACRO jsonb_object_agg(key, value) AS to_json(map(array_agg(key), array_agg(value)))`,
-		`CREATE MACRO jsonb_array_length(json) AS CAST(json_array_length(json) AS BIGINT)`,
+		`CREATE MACRO jsonb_array_length(json) AS CAST(json_array_length(json) AS INTEGER)`,
 		`CREATE MACRO jsonb_pretty(json) AS json_pretty(json)`,
 		`CREATE MACRO json_array_elements(json) AS unnest(json_extract(json, '$[*]'))`,
 		`CREATE MACRO jsonb_array_elements(json) AS unnest(json_extract(json, '$[*]'))`,