CreateQuery test_foo (children 3)
 Identifier test_foo
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration insecure_$ (children 1)
    DataType Int8
   ColumnDeclaration date (children 1)
    DataType Date
   ColumnDeclaration town (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 3)
  Function MergeTree
  Function toYear (children 1)
   ExpressionList (children 1)
    Identifier date
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier town
    Identifier date
