[DATABASE][MariaDB] Always use LONGBLOB for "blob"

"blob" is practically used with the expectation of unlimited length, which is
true with PostgreSQL's bytea, but not with MariaDB's BLOB, which is limited to
64KiB.
So instead use LONGBLOB, which has a maximum of 4GiB, effectively unlimited.

lib/database/mysqlschema.php

@@ -517,24 +517,31 @@ class MysqlSchema extends Schema
         $map = [
             'integer' => 'int',
             'numeric' => 'decimal',
+            'blob'    => 'longblob',
         ];
 
         $type = $column['type'];
-        if (isset($map[$type])) {
+        if (array_key_exists($type, $map)) {
             $type = $map[$type];
         }
 
-        if (!empty($column['size'])) {
-            $size = $column['size'];
-            if ($type == 'int' &&
-                in_array($size, ['tiny', 'small', 'medium', 'big'])) {
-                $type = $size . $type;
-            } elseif ($type == 'float' && $size == 'big') {
-                $type = 'double';
-            } elseif (in_array($type, ['blob', 'text']) &&
-                in_array($size, ['tiny', 'medium', 'long'])) {
-                $type = $size . $type;
-            }
+        $size = $column['size'] ?? null;
+        switch ($type) {
+            case 'int':
+                if (in_array($size, ['tiny', 'small', 'medium', 'big'])) {
+                    $type = $size . $type;
+                }
+                break;
+            case 'float':
+                if ($size === 'big') {
+                    $type = 'double';
+                }
+                break;
+            case 'text':
+                if (in_array($size, ['tiny', 'medium', 'long'])) {
+                    $type = $size . $type;
+                }
+                break;
         }
 
         return $type;

lib/database/pgsqlschema.php

@@ -419,21 +419,24 @@ class PgsqlSchema extends Schema
         ];
 
         $type = $column['type'];
-        if (isset($map[$type])) {
+        if (array_key_exists($type, $map)) {
             $type = $map[$type];
         }
 
         $size = $column['size'] ?? null;
-        if ($type === 'int') {
-            if (in_array($size, ['tiny', 'small'])) {
-                $type = 'int2';
-            } elseif ($size === 'big') {
-                $type = 'int8';
-            } else {
-                $type = 'int4';
-            }
-        } elseif ($type === 'float') {
-            $type = ($size !== 'big') ? 'float4' : 'float8';
+        switch ($type) {
+            case 'int':
+                if (in_array($size, ['tiny', 'small'])) {
+                    $type = 'int2';
+                } elseif ($size === 'big') {
+                    $type = 'int8';
+                } else {
+                    $type = 'int4';
+                }
+                break;
+            case 'float':
+                $type = ($size !== 'big') ? 'float4' : 'float8';
+                break;
         }
 
         return $type;