ScanBuilder¶

ScanBuilder is an abstraction of scan builders.

Contract¶

Building Scan¶

Scan build()

Builds a Scan

See:

• ParquetScanBuilder

Used when:

• DataSourceV2Relation logical operator is requested to computeStats
• DescribeColumnExec physical command is executed
• PushDownUtils is requested to pruneColumns
• V2ScanRelationPushDown logical optimization is executed (to buildScanWithPushedAggregate)
• MicroBatchExecution (Spark Structured Streaming) is requested for the logicalPlan
• ContinuousExecution (Spark Structured Streaming) is requested for the logicalPlan

Implementations¶

• FileScanBuilder
• JDBCScanBuilder
• MemoryStreamScanBuilder (Spark Structured Streaming)
• SupportsPushDownAggregates
• SupportsPushDownFilters
• SupportsPushDownLimit
• SupportsPushDownRequiredColumns
• SupportsPushDownTableSample
• SupportsPushDownTopN
• SupportsPushDownV2Filters