Type from which we query the data
Type from which we query the data
This map registers for each type corresponding extractor
This map registers for each type corresponding extractor
Given a a column number, returns an Option[T] with the value parsed according to the type. You can override it.
A map from type name to option reader
Chunk Idx/Partition index
Chunk Idx/Partition index
For a given array of source column indexes and required data types, produces an array of value providers.
For a given array of source column indexes and required data types, produces an array of value providers.
lists which columns we need, and what are the required types
an array of value providers. Each provider gives the current column value
Key pointing to H2OFrame containing the data
Key pointing to H2OFrame containing the data
Number of rows in this partition
Number of rows in this partition
Returns Option with data was successfully obtained or none otherwise
Returns Option with data was successfully obtained or none otherwise
Returns the data if it was obtained successfully or the default value
Returns the data if it was obtained successfully or the default value
Current row index
Current row index