CreateQuery event_types (children 3)
 Identifier event_types
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration type (children 1)
    DataType String
   ColumnDeclaration active (children 1)
    DataType Int16
 Storage definition (children 3)
  Function MergeTree
  Function substring (children 1)
   ExpressionList (children 3)
    Identifier type
    Literal UInt64_1
    Literal UInt64_1
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier type
    Identifier active
