styling etc ...

r/DESCRIPTION

@@ -61,6 +61,7 @@ Collate:
     'memory_pool.R'
     'message.R'
     'on_exit.R'
+    'parquet.R'
     'read_record_batch.R'
     'read_table.R'
     'reexports-bit64.R'

r/NAMESPACE

@@ -113,6 +113,7 @@ export(print.integer64)
 export(read_arrow)
 export(read_feather)
 export(read_message)
+export(read_parquet)
 export(read_record_batch)
 export(read_schema)
 export(read_table)

r/R/parquet.R

@@ -0,0 +1,27 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+#' Read parquet file from disk
+#'
+#' @param files a vector of filenames
+#'
+#' @importFrom purrr map_dfr
+#'
+#' @export
+read_parquet <- function(files) {
+  map_dfr(files, ~as_tibble(shared_ptr(`arrow::Table`, read_parquet_file(f))))
+}

r/README.Rmd

@@ -25,7 +25,7 @@ git clone https://github.com/apache/arrow.git
 cd arrow/cpp && mkdir release && cd release
 
 # It is important to statically link to boost libraries
-cmake .. -DCMAKE_BUILD_TYPE=Release -DARROW_BOOST_USE_SHARED:BOOL=Off
+cmake .. -DARROW_PARQUET=ON -DCMAKE_BUILD_TYPE=Release -DARROW_BOOST_USE_SHARED:BOOL=Off
 make install
 ```
 

r/README.md

@@ -14,7 +14,7 @@ git clone https://github.com/apache/arrow.git
 cd arrow/cpp && mkdir release && cd release
 
 # It is important to statically link to boost libraries
-cmake .. -DCMAKE_BUILD_TYPE=Release -DARROW_BOOST_USE_SHARED:BOOL=Off
+cmake .. -DARROW_PARQUET=ON -DCMAKE_BUILD_TYPE=Release -DARROW_BOOST_USE_SHARED:BOOL=Off
 make install
 ```
 
@@ -38,48 +38,19 @@ tf <- tempfile()
 #> # A tibble: 10 x 2
 #>        x       y
 #>    <int>   <dbl>
-#>  1     1 -0.255
-#>  2     2 -0.162
-#>  3     3 -0.614
-#>  4     4 -0.322
-#>  5     5  0.0693
-#>  6     6 -0.920
-#>  7     7 -1.08
-#>  8     8  0.658
-#>  9     9  0.821
-#> 10    10  0.539
-arrow::write_arrow(tib, tf)
-
-# read it back with pyarrow
-pa <- import("pyarrow")
-as_tibble(pa$open_file(tf)$read_pandas())
-#> # A tibble: 10 x 2
-#>        x       y
-#>    <int>   <dbl>
-#>  1     1 -0.255
-#>  2     2 -0.162
-#>  3     3 -0.614
-#>  4     4 -0.322
-#>  5     5  0.0693
-#>  6     6 -0.920
-#>  7     7 -1.08
-#>  8     8  0.658
-#>  9     9  0.821
-#> 10    10  0.539
-```
-
-## Development
-
-### Code style
-
-We use Google C++ style in our C++ code. Check for style errors with
-
-```
-./lint.sh
-```
-
-You can fix the style issues with
-
+#>  1     1  0.0855
+#>  2     2 -1.68  
+#>  3     3 -0.0294
+#>  4     4 -0.124 
+#>  5     5  0.0675
+#>  6     6  1.64  
+#>  7     7  1.54  
+#>  8     8 -0.0209
+#>  9     9 -0.982 
+#> 10    10  0.349
+# arrow::write_arrow(tib, tf)
+
+# # read it back with pyarrow
+# pa <- import("pyarrow")
+# as_tibble(pa$open_file(tf)$read_pandas())
 ```
-./lint.sh --fix
-```

r/configure

@@ -26,7 +26,7 @@
 # R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'
 
 # Library settings
-PKG_CONFIG_NAME="arrow"
+PKG_CONFIG_NAME="arrow parquet"
 PKG_DEB_NAME="arrow"
 PKG_RPM_NAME="arrow"
 PKG_CSW_NAME="arrow"

r/src/parquetfilereader.cpp

@@ -0,0 +1,38 @@
+// // Licensed to the Apache Software Foundation (ASF) under one
+// // or more contributor license agreements.  See the NOTICE file
+// // distributed with this work for additional information
+// // regarding copyright ownership.  The ASF licenses this file
+// // to you under the Apache License, Version 2.0 (the
+// // "License"); you may not use this file except in compliance
+// // with the License.  You may obtain a copy of the License at
+// //
+// //   http://www.apache.org/licenses/LICENSE-2.0
+// //
+// // Unless required by applicable law or agreed to in writing,
+// // software distributed under the License is distributed on an
+// // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// // KIND, either express or implied.  See the License for the
+// // specific language governing permissions and limitations
+// // under the License.
+//
+//
+#include <arrow/api.h>
+#include <arrow/io/api.h>
+#include <parquet/arrow/reader.h>
+#include <parquet/arrow/writer.h>
+#include <parquet/exception.h>
+
+// [[Rcpp::export]]
+std::shared_ptr<arrow::Table> read_parquet_file(std::string filename) {
+  std::shared_ptr<arrow::io::ReadableFile> infile;
+  PARQUET_THROW_NOT_OK(
+      arrow::io::ReadableFile::Open(filename, arrow::default_memory_pool(), &infile));
+
+  std::unique_ptr<parquet::arrow::FileReader> reader;
+  PARQUET_THROW_NOT_OK(
+      parquet::arrow::OpenFile(infile, arrow::default_memory_pool(), &reader));
+  std::shared_ptr<arrow::Table> table;
+  PARQUET_THROW_NOT_OK(reader->ReadTable(&table));
+
+  return table;
+}