spark技术分享

2012-04-15admin阅读(1633)赞(0)

Hint Framework Structured queries can be optimized using Hint Framework that allows for specifying query hints. ...

2012-04-14admin阅读(1662)赞(0)

Subqueries (Subquery Expressions) As of Spark 2.0, Spark SQL supports subqueries. A subquery (aka subquery expre ...

2012-04-13admin阅读(1464)赞(0)

DataSource API V2 DataSource API V2 (aka DataSource V2) is a new Data Source API (that will eventually replace the ...

2012-04-12admin阅读(1769)赞(0)

SpecificParquetRecordReaderBase — Hadoop RecordReader

2012-04-11admin阅读(2299)赞(0)

VectorizedParquetRecordReader VectorizedParquetRecordReader is a SpecificParquetRecordReaderBase for parquet file ...

2012-04-10admin阅读(2800)赞(0)

Vectorized Parquet Reader Vectorized Parquet Reader (aka Vectorized Parquet Decoding) allows for reading datasets ...

2012-04-09admin阅读(1420)赞(0)

SupportsScanColumnarBatch SupportsScanColumnarBatch is the contract…​FIXME [crayon-682207d9b25fd63728 ...

2012-04-08admin阅读(1618)赞(0)

ColumnarBatch ColumnarBatch is…​FIXME ColumnarBatch is created when: InMemoryTableScanExec is re ...

2012-04-07admin阅读(1388)赞(0)

Vectorized Query Execution (Batch Decoding)

2012-04-06admin阅读(1595)赞(0)

BytesToBytesMap Append-Only Hash Map BytesToBytesMap is…​FIXME Low space overhead, Good memory l ...