ENGCOM-4860: Fix MySQL syntax error on indexation with certain attribute codes #22559

Author: sidolov

app/code/Magento/Catalog/Model/Indexer/Product/Flat/FlatTableBuilder.php

@@ -11,6 +11,7 @@
 
 /**
  * Class FlatTableBuilder
+ *
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class FlatTableBuilder
@@ -354,6 +355,7 @@ protected function _updateTemporaryTableByStoreValues(
                 //Update not simple attributes (eg. dropdown)
                 $columnName = $attributeCode . $valueFieldSuffix;
                 if (isset($flatColumns[$columnName])) {
+                    $columnValue = $this->_connection->getIfNullSql('ts.value', 't0.value');
                     $select = $this->_connection->select();
                     $select->joinLeft(
                         ['t0' => $this->_productIndexerHelper->getTable('eav_attribute_option_value')],
@@ -364,8 +366,8 @@ protected function _updateTemporaryTableByStoreValues(
                         'ts.option_id = et.' . $attributeCode . ' AND ts.store_id = ' . $storeId,
                         []
                     )->columns(
-                        [$columnName => $this->_connection->getIfNullSql('ts.value', 't0.value')]
-                    )->where($attributeCode . ' IS NOT NULL');
+                        [$columnName => $columnValue]
+                    )->where($columnValue . ' IS NOT NULL');
                     if (!empty($changedIds)) {
                         $select->where($this->_connection->quoteInto('et.entity_id IN (?)', $changedIds));
                     }
@@ -389,7 +391,7 @@ protected function _getTemporaryTableName($tableName)
     }
 
     /**
-     * Get MetadataPool
+     * Get metadata pool
      *
      * @return \Magento\Framework\EntityManager\MetadataPool
      */