fix repeated QueryBuilder::from() call [closes #230]

src/QueryBuilder/QueryBuilder.php

@@ -178,6 +178,7 @@ public function from(string $fromExpression, ?string $alias = null, ...$args): s
 	{
 		$this->dirty();
 		$this->from = [$fromExpression, $alias];
+		$this->args['from'] = [];
 		$this->pushArgs('from', $args);
 		return $this;
 	}

tests/cases/unit/QueryBuilderTest.from.php

@@ -0,0 +1,25 @@
+<?php declare(strict_types = 1);
+
+/** @testCase */
+
+namespace NextrasTests\Dbal;
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+
+class QueryBuilderFromTest extends QueryBuilderTestCase
+{
+	public function testRepeatedCall()
+	{
+		$this->assertBuilder(
+			['SELECT * FROM foo'],
+			$this->builder()
+				->from('%table', 'alias', 'tableName')
+				->from('foo')
+		);
+	}
+}
+
+
+$test = new QueryBuilderFromTest();
+$test->run();