Mapping the json type to JSONB in postgres

I made a mistake in my previous pull request by mapping the json
type to plain JSON in postgres, when it should have been JSONB.

JSONB has the advantage that values inside can be indexed and searched
very efficiently.

src/Database/Schema/PostgresSchema.php

@@ -345,7 +345,7 @@ public function columnSql(Table $table, $name)
             'datetime' => ' TIMESTAMP',
             'timestamp' => ' TIMESTAMP',
             'uuid' => ' UUID',
-            'json' => ' JSON'
+            'json' => ' JSONB'
         ];
 
         if (isset($typeMap[$data['type']])) {

tests/TestCase/Database/Schema/PostgresSchemaTest.php

@@ -73,7 +73,7 @@ protected function _createTables($connection)
 published BOOLEAN DEFAULT false,
 views SMALLINT DEFAULT 0,
 readingtime TIME,
-data JSON,
+data JSONB,
 created TIMESTAMP,
 CONSTRAINT "content_idx" UNIQUE ("title", "body"),
 CONSTRAINT "author_idx" FOREIGN KEY ("author_id") REFERENCES "schema_authors" ("id") ON DELETE RESTRICT ON UPDATE CASCADE
@@ -205,6 +205,10 @@ public static function convertColumnProvider()
                 'JSON',
                 ['type' => 'json', 'length' => null]
             ],
+            [
+                'JSONB',
+                ['type' => 'json', 'length' => null]
+            ],
         ];
     }
 
@@ -988,7 +992,7 @@ public function testCreateSql()
 "id" SERIAL,
 "title" VARCHAR NOT NULL,
 "body" TEXT,
-"data" JSON,
+"data" JSONB,
 "created" TIMESTAMP,
 PRIMARY KEY ("id")
 )