CreateQuery testCollapsingMT (children 3)
 Identifier testCollapsingMT
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration uid (children 1)
    DataType String
   ColumnDeclaration version (children 1)
    DataType UInt32
   ColumnDeclaration is_deleted (children 1)
    DataType UInt8
   ColumnDeclaration sign (children 1)
    DataType Int8
 Storage definition (children 3)
  Function CollapsingMergeTree (children 1)
   ExpressionList (children 1)
    Identifier sign
  Identifier uid
  Set
