2 Module file.
| (require parquet/file) | package: parquet |
Read/Write Apache Parquet format files.
> (require parquet/file parquet/generated/parquet thrift/transport/common) > (define tport (open-input-parquet-file "../test-data/nation.impala.parquet")) file-not-exists: arity mismatch;
the expected number of arguments does not match the given
number
expected: 2
given: 1
> (define metadata (read-metadata tport)) tport: undefined;
cannot reference an identifier before its definition
in module: top-level
> (displayln (format "File Metadata: ~a, Version: ~a, Num Rows: ~a" (transport-source tport) (file-metadata-version metadata) (file-metadata-num-rows metadata))) tport: undefined;
cannot reference an identifier before its definition
in module: top-level
> (close-parquet-file tport) tport: undefined;
cannot reference an identifier before its definition
in module: top-level
2.1 File Handling
procedure
(open-input-parquet-file file-path) → transport?
file-path : string?
procedure
(close-parquet-file transport) → void?
transport : transport?
2.2 Decoding
procedure
(read-metadata transport) → file-metadata?
transport : transport?
2.3 Command Line Launcher
TBD
rparquet [ <option> ... ] <file-path> |
where <option> is one of |
-v, --verbose : Compile with verbose messages |
-V, --very-verbose : Compile with very verbose messages |
--help, -h : Show this help |
-- : Do not treat any remaining argument as a switch (at this level) |
Multiple single-letter switches can be combined after one `-'; for |
example: `-h-' is the same as `-h --' |