CreateQuery my_first_table (children 3)
 Identifier my_first_table
 Columns definition (children 1)
  ExpressionList (children 5)
   ColumnDeclaration user_id (children 1)
    DataType UInt32
   ColumnDeclaration job_id (children 1)
    DataType UInt32
   ColumnDeclaration message (children 1)
    DataType String
   ColumnDeclaration timestamp (children 1)
    DataType DateTime
   ColumnDeclaration metric (children 1)
    DataType Float32
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier user_id
    Identifier timestamp
