Uwe L. Korn created PARQUET-749:

             Summary: Schema building ParquetFileWriter
                 Key: PARQUET-749
                 URL: https://issues.apache.org/jira/browse/PARQUET-749
             Project: Parquet
          Issue Type: New Feature
          Components: parquet-cpp
            Reporter: Uwe L. Korn
            Assignee: Uwe L. Korn

Sometimes you want to write a Parquet file column-by-column without knowing the 
whole schema upfront. Format-wise this should be possible if you only have a 
single RowGroup. The user would write column after column and only at the end 
(when we need to write the metadata), the whole schema can be assembled.

Currently ParquetFileWriter only supports writing files when the schema is 
known upfront.

Limitations for the start:
 * A single RowGroup is written
 * No nestings

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