HashedRelationBroadcastMode

2013-07-03 分类：spark-sql 阅读(2137) 评论(0)

HashedRelationBroadcastMode is a BroadcastMode that BroadcastHashJoinExec uses for the required output distribution of child operators.

HashedRelationBroadcastMode takes build-side join keys (as Catalyst expressions) when created.

HashedRelationBroadcastMode gives a copy of itself with keys canonicalized when requested for a canonicalized version.



transform(rows: Array[InternalRow]): HashedRelation (1)
transform(
  rows: Iterator[InternalRow],
  sizeHint: Option[Long]): HashedRelation

transform(rows: Array[InternalRow]): HashedRelation (1)

transform(

rows: Iterator[InternalRow],

sizeHint: Option[Long]): HashedRelation

Note	`transform` is part of BroadcastMode Contract to…FIXME.

transform…FIXME

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