Issue #3487533 by mglaman, catch, larowlan, wim leers, daffie, longwave:...

Issue #3487533 by mglaman, catch, larowlan, wim leers, daffie, longwave: Cannot modify a table which uses JSON type

(cherry picked from commit 75dcfd20)

core/modules/sqlite/src/Driver/Database/sqlite/Schema.php

@@ -249,6 +249,11 @@ public function getFieldTypeMap() {
 
       'blob:big'        => 'BLOB',
       'blob:normal'     => 'BLOB',
+
+      // Only the SQLite driver has this field map to due to a fatal error
+      // error caused by this driver's schema on table introspection.
+      // @todo Add support to all drivers in https://drupal.org/i/3343634
+      'json:normal'     => 'JSON',
     ];
     return $map;
   }

core/tests/Drupal/KernelTests/Core/Database/DriverSpecificSchemaTestBase.php

@@ -272,6 +272,16 @@ public function testSchema(): void {
     // Test the primary key columns.
     $this->assertSame(['test_serial', 'test_composite_primary_key'], $method->invoke($this->schema, 'test_table'));
 
+    // Test adding and removing JSON column.
+    $this->schema->addField('test_table', 'test_json', [
+      'description' => 'I heard you liked JSON.',
+      'type' => 'json',
+      'pgsql_type' => 'jsonb',
+      'mysql_type' => 'json',
+      'sqlite_type' => 'json',
+    ]);
+    $this->schema->dropField('test_table', 'test_json');
+
     // Test renaming of keys and constraints.
     $this->schema->dropTable('test_table');
     $table_specification = [