类的使用
org.tikv.common.meta.TiDAGRequest

使用TiDAGRequest的程序包

程序包	说明
org.tikv.common
org.tikv.common.meta
org.tikv.common.operation
org.tikv.common.operation.iterator
org.tikv.common.predicates

org.tikv.common中TiDAGRequest的使用

参数类型为TiDAGRequest的org.tikv.common中的方法

限定符和类型	方法和说明
Iterator<Long>	Snapshot.indexHandleRead(TiDAGRequest dagRequest, List<RangeSplitter.RegionTask> tasks) Below is lower level API for env like Spark which already did key range split Perform handle scan
Iterator<TiChunk>	Snapshot.tableReadChunk(TiDAGRequest dagRequest, List<RangeSplitter.RegionTask> tasks, int numOfRows)
Iterator<Row>	Snapshot.tableReadRow(TiDAGRequest dagRequest, long physicalId) Issue a table read request

org.tikv.common.meta中TiDAGRequest的使用

返回TiDAGRequest的org.tikv.common.meta中的方法

限定符和类型	方法和说明
TiDAGRequest	TiDAGRequest.addAggregate(AggregateFunction expr)
TiDAGRequest	TiDAGRequest.addFilters(List<Expression> filters)
TiDAGRequest	TiDAGRequest.addGroupByItem(ByItem byItem) add a group by clause to select query
TiDAGRequest	TiDAGRequest.addOrderByItem(ByItem byItem) add a order by clause to select query.
TiDAGRequest	TiDAGRequest.addRanges(Map<Long,List<Coprocessor.KeyRange>> ranges) set key range of scan
TiDAGRequest	TiDAGRequest.addRequiredColumn(ColumnRef column) Field is not support in TiDB yet, for here we simply allow TiColumnRef instead of TiExpr like in SelectRequest proto This interface allows duplicate columns and it's user's responsibility to do dedup since we need to ensure exact order and items preserved during decoding
TiDAGRequest	TiDAGRequest.Builder.build(TiDAGRequest.PushDownType pushDownType)
TiDAGRequest	TiDAGRequest.copy()
TiDAGRequest	TiDAGRequest.copyReqWithPhysicalId(long id)
TiDAGRequest	TiDAGRequest.setDistinct(boolean distinct)
TiDAGRequest	TiDAGRequest.setHaving(Expression having) set having clause to select query
TiDAGRequest	TiDAGRequest.setIndexInfo(TiIndexInfo indexInfo)
TiDAGRequest	TiDAGRequest.setLimit(int limit) add limit clause to select query.
TiDAGRequest	TiDAGRequest.setPhysicalId(long id)
TiDAGRequest	TiDAGRequest.setStartTs(TiTimestamp startTs) set start timestamp for the transaction
TiDAGRequest	TiDAGRequest.setTableInfo(TiTableInfo tableInfo)

org.tikv.common.operation中TiDAGRequest的使用

参数类型为TiDAGRequest的org.tikv.common.operation中的方法

限定符和类型	方法和说明
static SchemaInfer	SchemaInfer.create(TiDAGRequest dagRequest)
static SchemaInfer	SchemaInfer.create(TiDAGRequest dagRequest, boolean readHandle)

org.tikv.common.operation.iterator中TiDAGRequest的使用

参数类型为TiDAGRequest的org.tikv.common.operation.iterator中的方法

限定符和类型	方法和说明
static CoprocessorIterator<Long>	CoprocessorIterator.getHandleIterator(TiDAGRequest req, List<RangeSplitter.RegionTask> regionTasks, TiSession session) Build a DAGIterator from TiDAGRequest and region tasks to get handles When we use getHandleIterator, we must be preforming a IndexScan.
static CoprocessorIterator<Row>	CoprocessorIterator.getRowIterator(TiDAGRequest req, List<RangeSplitter.RegionTask> regionTasks, TiSession session) Build a DAGIterator from TiDAGRequest and region tasks to get rows When we are preforming a scan request using coveringIndex, IndexScan should be used to read index rows.
static CoprocessorIterator<TiChunk>	CoprocessorIterator.getTiChunkIterator(TiDAGRequest req, List<RangeSplitter.RegionTask> regionTasks, TiSession session, int numOfRows) Build a DAGIterator from TiDAGRequest and region tasks to get rows When we are preforming a scan request using coveringIndex, IndexScan should be used to read index rows.

参数类型为TiDAGRequest的org.tikv.common.operation.iterator中的构造器

构造器和说明
IndexScanIterator(Snapshot snapshot, TiDAGRequest req, Iterator<Long> handleIterator)

org.tikv.common.predicates中TiDAGRequest的使用

返回TiDAGRequest的org.tikv.common.predicates中的方法

限定符和类型	方法和说明
TiDAGRequest	TiKVScanAnalyzer.buildTiDAGReq(boolean allowIndexScan, boolean canUseTiKV, boolean canUseTiFlash, List<TiColumnInfo> columnList, List<Expression> conditions, TiTableInfo table, TableStatistics tableStatistics, TiTimestamp ts, TiDAGRequest dagRequest)
TiDAGRequest	TiKVScanAnalyzer.buildTiDAGReq(List<TiColumnInfo> columnList, List<Expression> conditions, TiTableInfo table, TiTimestamp ts, TiDAGRequest dagRequest)

参数类型为TiDAGRequest的org.tikv.common.predicates中的方法

限定符和类型	方法和说明
TiDAGRequest	TiKVScanAnalyzer.buildTiDAGReq(boolean allowIndexScan, boolean canUseTiKV, boolean canUseTiFlash, List<TiColumnInfo> columnList, List<Expression> conditions, TiTableInfo table, TableStatistics tableStatistics, TiTimestamp ts, TiDAGRequest dagRequest)
TiDAGRequest	TiKVScanAnalyzer.buildTiDAGReq(List<TiColumnInfo> columnList, List<Expression> conditions, TiTableInfo table, TiTimestamp ts, TiDAGRequest dagRequest)