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Posted to jira@arrow.apache.org by "Samay Kapadia (Jira)" <ji...@apache.org> on 2020/12/18 11:27:00 UTC
[jira] [Created] (ARROW-10958) "Nested data conversions not
implemented" through glib, but not through pyarrow
Samay Kapadia created ARROW-10958:
-------------------------------------
Summary: "Nested data conversions not implemented" through glib, but not through pyarrow
Key: ARROW-10958
URL: https://issues.apache.org/jira/browse/ARROW-10958
Project: Apache Arrow
Issue Type: Bug
Components: GLib
Affects Versions: 2.0.0
Environment: macOS Catalina 10.15.7
Reporter: Samay Kapadia
Hey all,
For some context, I am trying to use Arrow's GLib interface through Julia; I have a sense that I can speedup by pandas workflows by using Julia and Apache Arrow.
I have a 1.7GB parquet file that can be read in about 20s by using pyarrow's parquet reader
{code:java}
pq.read_table(path)
{code}
but I've tried to go the same through the GLib interface in Julia and I'm seeing
{code:java}
[parquet][arrow][file-reader][read-table]: NotImplemented: Nested data conversions not implemented for chunked array outputs
{code}
{{Arrow was installed using }}
{{brew install apache-arrow-glib}}
{{and it installed version 2.0.0}}
Here's my Julia code:
{code:java}
using Pkg
Pkg.add("Gtk")
using Gtk.GLib
using Gtk
path = "..." # contains columns that are lists of strings
struct _GParquetArrowFileReader
parent_instance::Cint
end
const GParquetArrowFileReader = _GParquetArrowFileReaderstruct
_GParquetArrowFileReaderClass
parent_class::Cint
end
const GParquetArrowFileReaderClass = _GParquetArrowFileReaderClass
struct _GArrowTable
parent_instance::Cint
end
const GArrowTable = _GArrowTable
struct _GArrowTableClass
parent_class::Cint
end
const GArrowTableClass = _GArrowTableClass
function parquet_arrow_file_reader_new_path(path::String)::Ptr{GParquetArrowFileReader}
ret::Ptr{GParquetArrowFileReader} = 0
GError() do error_check
ret = ccall(
(:gparquet_arrow_file_reader_new_path, "/usr/local/Cellar/apache-arrow-glib/2.0.0/lib/libparquet-glib.200"),
Ptr{GParquetArrowFileReader},
(Ptr{UInt8}, Ptr{Ptr{GError}}),
Gtk.bytestring(path), error_check
)
ret != 0
end
ret
end
function parquet_arrow_file_reader_read_table(reader::Ptr{GParquetArrowFileReader})::Ptr{GArrowTable}
ret::Ptr{GArrowTable} = 0
GError() do error_check
ret = ccall(
(:gparquet_arrow_file_reader_read_table, "/usr/local/Cellar/apache-arrow-glib/2.0.0/lib/libparquet-glib.200"),
Ptr{GParquetArrowFileReader},
(Ptr{GParquetArrowFileReader}, Ptr{Ptr{GError}}),
reader, error_check
)
ret != 0
end
ret
end
reader = parquet_arrow_file_reader_new_path(path)
tbl = parquet_arrow_file_reader_read_table(reader)
{code}
Am I doing something wrong or is there a behavior discrepancy between pyarrow and glib?
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