CreateQuery t_github_json (children 3)
 Identifier t_github_json
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration event_type (children 2)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
    Function JSONExtractString (children 1)
     ExpressionList (children 2)
      Identifier message_raw
      Literal \'type\'
   ColumnDeclaration repo_name (children 2)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
    Function JSONExtractString (children 1)
     ExpressionList (children 3)
      Identifier message_raw
      Literal \'repo\'
      Literal \'name\'
   ColumnDeclaration message (children 2)
    DataType JSON
    Function if (children 1)
     ExpressionList (children 3)
      Function empty (children 1)
       ExpressionList (children 1)
        Identifier message_raw
      Literal \'{}\'
      Identifier message_raw
   ColumnDeclaration message_raw (children 2)
    DataType String
    Function defaultValueOfTypeName
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier event_type
    Identifier repo_name
