CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration c1 (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration c2 (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration c3 (children 1)
    DataType UInt32
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 3)
    Identifier c1
    Identifier c2
    Identifier c3
  Set
