v0.13.0

A new version (0.13) is now available on crates.io! 🎉🎉🎉🎉

This is another large release of arrow2. Among the many, many changes (see below), it is worth noting:

• Added copy-on-write API to perform operations in place, improving performance of expressions like (a + b) * 2 by a factor of 2-10x
• Added support to read from Apache ORC format
• Added support for projection and limit pushdown when reading from Arrow IPC format
• Added support for f16

Thank you to the numerous contributors, both via PRs and issues, that resulted in this fantastic release 🙇

Breaking changes:

• Made nested argument of array_to_pages non-owning #1174
• Replaced Result by panic in boolean comparison #1159 (jorgecarleitao)
• Improved dictionary invariants #1137 (jorgecarleitao)
• Change signature of PrimitiveScalar::value to return reference #1129 (ncpenke)
• Removed need to pass encodings by value #1123 (ritchie46)
• Removed unused NativeType::to_ne_bytes #1112 (jorgecarleitao)
• Avoid clone in with_validity #1104 (jorgecarleitao)
• Reduced need of unsafe in FFI #1100 (jorgecarleitao)
• Removed Buffer::into_mut and make_mut functions #1089 (jorgecarleitao)
• Renamed Bitmap::null_count to Bitmap::unset_bits #1087 (jorgecarleitao)
• Made chunk_size optional in parquet's column_iter_to_arrays #1055 (jorgecarleitao)
• Migrated from Arc<dyn Array> to Box<dyn Array> #1042 (jorgecarleitao)

New features:

• Added support to read ORC #1189 (jorgecarleitao)
• Added support for limit pushdown to IPC reading #1135 (jorgecarleitao)
• Added support to write and read Intervals from and to parquet #1122 (jorgecarleitao)
• Added support to write FixedSizeBinary to Avro #1118 (jorgecarleitao)
• Added support for projections in reading IPC streams #1097 (joshuataylor)
• Added support to write parquet _metadata sidecar #1063 (jorgecarleitao)
• Added cow APIs (2x-10x vs non-cow) #1061 (jorgecarleitao)
• Added support to read and write f16 #1051 (jorgecarleitao)

Fixed bugs:

• Fixed error not implemented error when reading plain, after-dict pages for fix-len-binary from parquet #1192 (jorgecarleitao)
• Fixed error in decoding nested multi-page columns from parquet #1188 (jorgecarleitao)
• Fixed error in counting items in nested parquet #1182 (jorgecarleitao)
• Fixed reading stats from int96 parquet #1181 (jorgecarleitao)
• Fixed limit pushdown in parquet #1180 (jorgecarleitao)
• use FnOnce for PrimitiveArray::apply_validity #1176 (ritchie46)
• release memory on predicate with 0% selectivity #1163 (ritchie46)
• Fixed error in reading Struct<List<...>> from parquet #1150 (jorgecarleitao)
• Fixed IPC projection #1149 (ritchie46)
• Fixed casting dictionary keys #1143 (ritchie46)
• Fixed reading arrays from parquet with required children #1140 (jorgecarleitao)
• Fixed panic in deserializing nested statistics #1139 (jorgecarleitao)
• Aligned name of FixedSizeBinaryArray::values_iter #1117 (jorgecarleitao)
• Fixed error in FixedSizeListArray::new_null #1114 (jorgecarleitao)
• Fixed panic in writing dictionaries to parquet #1113 (jorgecarleitao)
• Fixed error in reading chunked parquet #1108 (jorgecarleitao)
• Raise error when invalid fields are passed to flight #1093 (jorgecarleitao)
• Made IPC projection not sort projection #1082 (jorgecarleitao)
• Fixed error in chunked_mut bitmap #1081 (jorgecarleitao)
• Fixed panic in bitmap assign_mut #1078 (ritchie46)
• Panic-free read of IPC files #1075 (jorgecarleitao)
• Bumped parquet2 (minor) requirement #1071 (jorgecarleitao)
• Fixed divide by zero on reading empty row group #1062 (jorgecarleitao)
• Fixed missing validation of number of encodings passed when writing to parquet #1057 (jorgecarleitao)

Enhancements:

• Improved performance of reading Binary from parquet #1190 (ritchie46)
• Bumped to latest nightly #1186 (gyscos)
• Improved error message #1179 (jorgecarleitao)
• Added support to read and write nested dictionaries to parquet #1175 (jorgecarleitao)
• Added MutableUtf8Array::into_data #1170 (ritchie46)
• Added Default for Utf8Array #1169 (ritchie46)
• fix(parquet): allow to read other logical types from parquet #1168 (sundy-li)
• fix(parquet): enforce to use ParquetTimeUnit::Nanoseconds for PhysicalType::Int96 #1167 (sundy-li)
• Added constructor MutableFixedSizeListArray::new_from #1161 (hohav)
• Removed unneeded Default constraint #1157 (hohav)
• Improved checks to safety invariants in FFI #1154 (jorgecarleitao)
• Removed un-needed indirection #1153 (jorgecarleitao)
• Soften generic constraint of Buffer #1152 (sundy-li)
• Use ahash by default #1148 (ritchie46)
• Reduced bound checks #1142 (ritchie46)
• Moved Bytes to own crate #1141 (jorgecarleitao)
• Fixed clippy for 1.62 #1134 (Xuanwo)
• Cleaned example #1130 (jorgecarleitao)
• Removed O(N) clone in writing CSV #1128 (jorgecarleitao)
• Avoid zeroed allocation in reading avro #1127 (jorgecarleitao)
• Reduced allocations of reading bitmaps from IPC #1126 (jorgecarleitao)
• Improved performance of reading from IPC #1125 (jorgecarleitao)
• Improved parquet read performance #1124 (jorgecarleitao)
• Optimized write nulls to Avro #1119 (jorgecarleitao)
• Made row_group::get_field_columns public #1110 (ritchie46)
• Removed some panics reading invalid parquet files #1106 (jorgecarleitao)
• Reduced reallocations when reading from IPC (~12%) #1105 (ritchie46)
• Exposed utilities in io::flight #1094 (jorgecarleitao)
• Accept decoding parquet's i64 into u32 written by pyarrow #1090 (jorgecarleitao)
• Simplified code #1088 (jorgecarleitao)
• Removed un-necessary allocation in assign_ops #1085 (jorgecarleitao)
• Replaced some macros by generics #1084 (jorgecarleitao)
• Improved performance of Bitmap::make_mut with offset #1079 (jorgecarleitao)
• Implemented Default for PrimitiveArray #1073 (ritchie46)
• Expose share counts in Buffer #1072 (ritchie46)
• Added compute::arity_assign #1070 (jorgecarleitao)
• Improved performance in lexical write (~5%) #1067 (ritchie46)
• Added cast to/from Null from/to every type #1066 (jorgecarleitao)
• prevent unneeded offset check #1059 (ritchie46)

Documentation updates:

• Fixed parquet write example #1193 (rajasekarv)
• Improved docs #1164 (jorgecarleitao)
• Minor cleanup of internal namings #1160 (jorgecarleitao)
• Added example reading Avro produced by Kafka #1151 (jorgecarleitao)
• Updated license wording #1138 (jorgecarleitao)
• Fixed wrong package name in examples #1133 (Xuanwo)
• Improved example #1131 (jorgecarleitao)
• Added more tests #1111 (jorgecarleitao)
• Improved examples #1109 (jorgecarleitao)
• Improved internal docs #1107 (jorgecarleitao)
• Added notes about creating parquet files and submodules in the development documentation #1096 (joshuataylor)
• Improved docs for BooleanArray #1083 (jorgecarleitao)
• Added missing link to guide #1065 (jorgecarleitao)
• Improve Docs Readability #1054 (ryanrussell)

Testing updates:

• Temporary skip decimal256 integration tests #1198 (jorgecarleitao)
• Simplified code #1183 (jorgecarleitao)
• Made kafka schema_id u32 in example #1162 (jorgecarleitao)
• Added more tests #1158 (jorgecarleitao)
• Bumped MIRI #1156 (jorgecarleitao)
• Simplified code in flight integration tests #1136 (jorgecarleitao)
• Added more tests for nested parquet #1121 (jorgecarleitao)
• Added more tests for reading and writing CSV #1120 (jorgecarleitao)
• Added test for scalar division #1115 (jorgecarleitao)
• Added more tests #1103 (jorgecarleitao)
• Enabled more integration tests with pyarrow #1102 (jorgecarleitao)
• Simplified Bytes (internal) #1099 (jorgecarleitao)
• Updated patch to arrow integration tests #1068 (jorgecarleitao)
• Added more tests #1064 (jorgecarleitao)