Add new analytic component "Estimated vs actual time per column"

app/Analytic/EstimatedActualColumnAnalytic.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Kanboard\Analytic;
+
+use Kanboard\Core\Base;
+use Kanboard\Model\TaskModel;
+
+/**
+ * Estimated vs actual time per column
+ *
+ * @package  analytic
+ * @author   Frederic Guillot
+ */
+class EstimatedActualColumnAnalytic extends Base
+{
+    /**
+     * Build report
+     *
+     * @access public
+     * @param  integer   $project_id    Project id
+     * @return array
+     */
+    public function build($project_id)
+    {
+        $rows = $this->db->table(TaskModel::TABLE)
+            ->columns('SUM(time_estimated) AS hours_estimated', 'SUM(time_spent) AS hours_spent', 'column_id')
+            ->eq('project_id', $project_id)
+            ->groupBy('column_id')
+            ->findAll();
+
+        $columns = $this->columnModel->getList($project_id);
+
+        $metrics = [];
+        foreach ($columns as $column_id => $column_title) {
+            $metrics[$column_id] = array(
+                'hours_spent' => 0,
+                'hours_estimated' => 0,
+                'title' => $column_title,
+            );
+        }
+
+        foreach ($rows as $row) {
+            $metrics[$row['column_id']]['hours_spent'] = (float) $row['hours_spent'];
+            $metrics[$row['column_id']]['hours_estimated'] = (float) $row['hours_estimated'];
+        }
+
+        return $metrics;
+    }
+}