CreateQuery collapsing (children 3)
 Identifier collapsing
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType Int64
   ColumnDeclaration sign (children 1)
    DataType Int8
 Storage definition (children 2)
  Function CollapsingMergeTree (children 1)
   ExpressionList (children 1)
    Identifier sign
  Identifier key
