feat: add support for table when clause

Author: yajra

src/SQLLoader.php

@@ -88,9 +88,10 @@ public function into(
         ?string $terminatedBy = ',',
         ?string $enclosedBy = '"',
         bool $trailing = false,
-        array $formatOptions = []
+        array $formatOptions = [],
+        ?string $when = null,
     ): static {
-        $this->tables[] = new TableDefinition($table, $columns, $terminatedBy, $enclosedBy, $trailing, $formatOptions);
+        $this->tables[] = new TableDefinition($table, $columns, $terminatedBy, $enclosedBy, $trailing, $formatOptions, $when);
 
         return $this;
     }

src/TableDefinition.php

@@ -14,14 +14,19 @@ public function __construct(
         public ?string $terminatedBy = null,
         public ?string $enclosedBy = null,
         public bool $trailing = false,
-        public array $formatOptions = []
+        public array $formatOptions = [],
+        public ?string $when = null,
     ) {
     }
 
     public function __toString(): string
     {
         $sql = "INTO TABLE {$this->table}".PHP_EOL;
 
+        if ($this->when) {
+            $sql .= "WHEN {$this->when}".PHP_EOL;
+        }
+
         if ($this->terminatedBy) {
             $sql .= "FIELDS TERMINATED BY '{$this->terminatedBy}' ";
         }

tests/Unit/TableDefinitionTest.php

@@ -87,3 +87,16 @@
         $table
     );
 });
+
+test('it can build with when clause', function () {
+    $table = new TableDefinition(
+        'users',
+        ['id', 'name', 'email'],
+        when: 'id > 0',
+    );
+
+    assertEquals(
+        "INTO TABLE users\nWHEN id > 0\n(\n  id,\n  name,\n  email\n)\n",
+        $table
+    );
+});