feat: Added $distinct parameter to SelectQuery::count

Author: bbldn

src/Query/SelectQuery.php

@@ -326,12 +326,14 @@ public function runChunks(int $limit, callable $callback): void
      *
      * @psalm-param non-empty-string $column Column to count by (every column by default).
      */
-    public function count(string $column = '*'): int
+    public function count(string $column = '*', bool $distinct = false): int
     {
         $select = clone $this;
 
         //To be escaped in compiler
-        $select->columns = ["COUNT({$column})"];
+        $select->columns = [
+            $distinct === true ? "COUNT(DISTINCT {$column})" : "COUNT({$column})",
+        ];
         $select->orderBy = [];
         $select->groupBy = [];
 

tests/Database/Functional/Driver/Common/Schema/TableTest.php

@@ -495,7 +495,7 @@ public function testCountDistinct(): void
             ],
         );
 
-        $this->assertSame(4, $table->select()->count('DISTINCT(id)'));
+        $this->assertSame(4, $table->select()->count('id', true));
     }
 
     public function setUp(): void