CreateQuery tab_with_primary_key_index (children 3)
 Identifier tab_with_primary_key_index
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt32
   ColumnDeclaration a (children 1)
    DataType UInt32
 Storage definition (children 2)
  Function MergeTree
  Identifier id
