[DDC-2435] Fix column name with numbers and non alphanumeric characters.

lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php

@@ -127,12 +127,15 @@ class DefaultQuoteStrategy implements QuoteStrategy
      */
     public function getColumnAlias($columnName, $counter, AbstractPlatform $platform, ClassMetadata $class = null)
     {
-        // Trim the column alias to the maximum identifier length of the platform.
-        // If the alias is to long, characters are cut off from the beginning.
-        // And strip non alphanumeric characters
+        // 1 ) Concatenate column name and counter
+        // 2 ) Trim the column alias to the maximum identifier length of the platform.
+        //     If the alias is to long, characters are cut off from the beginning.
+        // 3 ) Strip non alphanumeric characters
+        // 4 ) Prefix with "_" if the result its numeric
         $columnName = $columnName . $counter;
         $columnName = substr($columnName, -$platform->getMaxIdentifierLength());
         $columnName = preg_replace('/[^A-Za-z0-9_]/', '', $columnName);
+        $columnName = is_numeric($columnName) ? '_' . $columnName : $columnName;
 
         return $platform->getSQLResultCasing($columnName);
     }

tests/Doctrine/Tests/Models/Quote/NumericEntity.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Doctrine\Tests\Models\Quote;
+
+/**
+ * @Entity
+ * @Table(name="table")
+ */
+class NumericEntity
+{
+    /**
+     * @Id
+     * @Column(type="integer", name="`1:1`")
+     * @GeneratedValue(strategy="AUTO")
+     */
+    public $id;
+
+    /**
+     * @Column(type="string", name="`2:2`")
+     */
+    public $value;
+
+    /**
+     * @param string $value
+     */
+    public function __construct($value)
+    {
+        $this->value = $value;
+    }
+
+}

tests/Doctrine/Tests/ORM/Query/SelectSqlGenerationTest.php

@@ -1810,6 +1810,27 @@ class SelectSqlGenerationTest extends \Doctrine\Tests\OrmTestCase
         );
     }
 
+    /**
+     * @group DDC-2435
+     */
+    public function testColumnNameWithNumbersAndNonAlphanumericCharacters()
+    {
+        $this->assertSqlGeneration(
+            'SELECT e FROM Doctrine\Tests\Models\Quote\NumericEntity e',
+            'SELECT t0_."1:1" AS _110, t0_."2:2" AS _221 FROM table t0_'
+        );
+
+        $this->assertSqlGeneration(
+            'SELECT e.value FROM Doctrine\Tests\Models\Quote\NumericEntity e',
+            'SELECT t0_."2:2" AS _220 FROM table t0_'
+        );
+
+        $this->assertSqlGeneration(
+            'SELECT TRIM(e.value) FROM Doctrine\Tests\Models\Quote\NumericEntity e',
+            'SELECT TRIM(t0_."2:2") AS sclr0 FROM table t0_'
+        );
+    }
+
    /**
     * @group DDC-1845
     */