BroadcastModes¶

BroadcastMode is an abstraction of broadcast modes that can transform internal rows (with optional size hint).

BroadcastMode is used to create:

• BroadcastDistribution
• BroadcastPartitioning
• BroadcastExchangeExec physical operator

Contract¶

Canonicalized Form¶

canonicalized: BroadcastMode

Transforming InternalRows into HashedRelation (with Optional Size Hint)¶

transform(
  rows: Iterator[InternalRow],
  sizeHint: Option[Long]): Any

Used when:

• BroadcastExchangeExec physical operator is requested for relationFuture

Transform Rows¶

transform(
  rows: Array[InternalRow]): Any

Implementations¶

• HashedRelationBroadcastMode
• IdentityBroadcastMode