Fix INFORMATION_SCHEMA.CONSTRAINTS.CONSTRAINT_TYPE regression

h2/src/main/org/h2/table/MetaTable.java

@@ -1688,7 +1688,8 @@ public class MetaTable extends Table {
                         // CONSTRAINT_NAME
                         identifier(constraint.getName()),
                         // CONSTRAINT_TYPE
-                        constraintType.toString(),
+                        constraintType == Constraint.Type.PRIMARY_KEY ?
+                                constraintType.getSqlName() : constraintType.name(),
                         // TABLE_CATALOG
                         catalog,
                         // TABLE_SCHEMA

h2/src/test/org/h2/test/scripts/information_schema.sql

@@ -41,6 +41,18 @@ SELECT CONSTRAINT_NAME, CONSTRAINT_TYPE, TABLE_NAME, IS_DEFERRABLE, INITIALLY_DE
 > FK_2            FOREIGN KEY     T2         NO            NO
 > rows (ordered): 5
 
+SELECT CONSTRAINT_NAME, CONSTRAINT_TYPE, TABLE_NAME, COLUMN_LIST FROM INFORMATION_SCHEMA.CONSTRAINTS
+    WHERE CONSTRAINT_CATALOG = DATABASE() AND CONSTRAINT_SCHEMA = SCHEMA() AND TABLE_CATALOG = DATABASE() AND TABLE_SCHEMA = SCHEMA()
+    ORDER BY TABLE_NAME, CONSTRAINT_NAME;
+> CONSTRAINT_NAME CONSTRAINT_TYPE TABLE_NAME COLUMN_LIST
+> --------------- --------------- ---------- -----------
+> PK_1            PRIMARY KEY     T1         C1,C2
+> U_1             UNIQUE          T1         C3,C4
+> CH_1            CHECK           T2         null
+> FK_1            REFERENTIAL     T2         C3,C4
+> FK_2            REFERENTIAL     T2         C3,C4
+> rows (ordered): 5
+
 SELECT * FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE LIMIT 0;
 > CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME ORDINAL_POSITION POSITION_IN_UNIQUE_CONSTRAINT
 > ------------------ ----------------- --------------- ------------- ------------ ---------- ----------- ---------------- -----------------------------