orc
所属分类：大数据
开发工具：GO
文件大小：10591KB
下载次数：0
上传日期：2021-05-13 14:41:43
上 传 者：
sh-1993
说明： Go的ORC文件格式读取器和编写器。
(An ORC file format reader and writer for Go.)
文件列表:
.travis.yml (92, 2021-05-13)
LICENSE (1083, 2021-05-13)
booleanreader.go (841, 2021-05-13)
booleanreader_test.go (1244, 2021-05-13)
booleanwriter.go (1086, 2021-05-13)
booleanwriter_test.go (1285, 2021-05-13)
buffererwriter.go (3415, 2021-05-13)
columnstatistics.go (7605, 2021-05-13)
compressioncodec.go (7228, 2021-05-13)
compressioncodec_test.go (1773, 2021-05-13)
cursor.go (4810, 2021-05-13)
cursor_test.go (3319, 2021-05-13)
decimal.go (1571, 2021-05-13)
decimal_test.go (544, 2021-05-13)
dictionary.go (1810, 2021-05-13)
dictionary_test.go (1888, 2021-05-13)
dictionary_v2.go (1161, 2021-05-13)
examples (0, 2021-05-13)
examples\TestOrcFile.columnProjection.orc (429075, 2021-05-13)
examples\TestOrcFile.emptyFile.orc (523, 2021-05-13)
examples\TestOrcFile.metaData.orc (41935, 2021-05-13)
examples\TestOrcFile.test1.orc (1711, 2021-05-13)
examples\TestOrcFile.testDate1900.orc (30941, 2021-05-13)
examples\TestOrcFile.testDate2038.orc (95787, 2021-05-13)
examples\TestOrcFile.testMemoryManagementV11.orc (19869, 2021-05-13)
examples\TestOrcFile.testMemoryManagementV12.orc (10864, 2021-05-13)
examples\TestOrcFile.testPredicatePushdown.orc (15708, 2021-05-13)
examples\TestOrcFile.testSeek.orc (1898095, 2021-05-13)
examples\TestOrcFile.testSnappy.orc (126370, 2021-05-13)
examples\TestOrcFile.testStringAndBinaryStatistics.orc (341, 2021-05-13)
examples\TestOrcFile.testStripeLevelStats.orc (851, 2021-05-13)
examples\TestOrcFile.testTimestamp.orc (289, 2021-05-13)
examples\TestOrcFile.testUnionAndTimestamp.orc (21432, 2021-05-13)
examples\TestOrcFile.testWithoutIndex.orc (214892, 2021-05-13)
examples\TestVectorOrcFile.testLz4.orc (121309, 2021-05-13)
examples\TestVectorOrcFile.testLzo.orc (121311, 2021-05-13)
examples\decimal.orc (16337, 2021-05-13)
... ...
# orc
[](https://travis-ci.org/scritchley/orc)
[](http://gocover.io/github.com/scritchley/orc)
[](https://godoc.org/github.com/scritchley/orc)
## Project Status
This project is still a work in progress.
## Current Support
| Column Encoding | Read | Write | Go Type |
|---------------------------|------|-------|-------------------------------------|
| SmallInt, Int, BigInt | | | int*** |
| Float, Double | | | float32, float*** |
| String, Char, and VarChar | | | string |
| Boolean | | | bool |
| TinyInt | | | byte |
| Binary | | | []byte |
| Decimal | | | orc.Decimal |
| Date | | | orc.Date (time.Time) |
| Timestamp | | | time.Time |
| Struct | | | orc.Struct (map[string]interface{}) |
| List | | | []interface{} |
| Map | | | []orc.MapEntry |
| Union | | | interface{} |
- The writer support is in its late stages, however, I do not recommend using it yet.
## Example
r, err := Open("./examples/demo-12-zlib.orc")
if err != nil {
log.Fatal(err)
}
defer r.Close()
// Create a new Cursor reading the provided columns.
c := r.Select("_col0", "_col1", "_col2")
// Iterate over each stripe in the file.
for c.Stripes() {
// Iterate over each row in the stripe.
for c.Next() {
// Retrieve a slice of interface values for the current row.
log.Println(c.Row())
}
}
if err := c.Err(); err != nil {
log.Fatal(err)
}
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