fix(postgres): Fixed a problem with array dimensions disappearing when using "ALTER TABLE ADD COLUMN" (#2572)

* fix(postgres): Fixed a problem with array dimensions disappearing when using "ALTER TABLE ADD COLUMN".

close #2571

* test: update endtoend

Author: orisano

internal/endtoend/testdata/ddl_alter_table_add_column/postgresql/pgx/v4/go/models.go

@@ -1,3 +1,4 @@
 CREATE TABLE foo (bar text NOT NULL);
 ALTER TABLE foo ADD COLUMN baz int;
 ALTER TABLE foo ADD bio int;
+ALTER TABLE foo ADD COLUMN foobar int[];

internal/endtoend/testdata/ddl_alter_table_add_column/postgresql/pgx/v4/schema.sql

@@ -1,3 +1,4 @@
 CREATE TABLE foo (bar text NOT NULL);
 ALTER TABLE foo ADD COLUMN baz int;
 ALTER TABLE foo ADD bio int;
+ALTER TABLE foo ADD COLUMN foobar int[];

internal/endtoend/testdata/ddl_alter_table_add_column/postgresql/pgx/v5/go/models.go

@@ -1,3 +1,4 @@
 CREATE TABLE foo (bar text NOT NULL);
 ALTER TABLE foo ADD COLUMN baz int;
 ALTER TABLE foo ADD bio int;
+ALTER TABLE foo ADD COLUMN foobar int[];

internal/endtoend/testdata/ddl_alter_table_add_column/postgresql/pgx/v5/schema.sql

@@ -57,6 +57,7 @@ func (table *Table) addColumn(cmd *ast.AlterTableCmd) error {
 		IsNotNull:  cmd.Def.IsNotNull,
 		IsUnsigned: cmd.Def.IsUnsigned,
 		IsArray:    cmd.Def.IsArray,
+		ArrayDims:  cmd.Def.ArrayDims,
 		Length:     cmd.Def.Length,
 	})
 	return nil