CreateQuery session_events (children 3)
 Identifier session_events
 Columns definition (children 1)
  ExpressionList (children 7)
   ColumnDeclaration clientId (children 1)
    DataType UInt64
   ColumnDeclaration sessionId (children 1)
    DataType String
   ColumnDeclaration pageId (children 1)
    DataType UInt64
   ColumnDeclaration eventNumber (children 1)
    DataType UInt64
   ColumnDeclaration timestamp (children 1)
    DataType UInt64
   ColumnDeclaration type (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration data (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Function toYYYYMM (children 1)
   ExpressionList (children 1)
    Function toDate (children 1)
     ExpressionList (children 1)
      Function divide (children 1)
       ExpressionList (children 2)
        Identifier pageId
        Literal UInt64_1000
  Function tuple (children 1)
   ExpressionList (children 4)
    Identifier clientId
    Identifier sessionId
    Identifier pageId
    Identifier timestamp
