RebalancePartitions Unary Logical Operator¶

RebalancePartitions is a unary logical operator that represents a REBALANCE hint in a logical query plan.

Creating Instance¶

RebalancePartitions takes the following to be created:

• Partition Expressions
• Child logical operator

RebalancePartitions is created when:

• ResolveCoalesceHints logical resolution rule is executed (to resolve a REBALANCE hint with Adaptive Query Execution enabled)

Partitioning¶

partitioning: Partitioning

partitioning is one of the following:

With no partition expressions, partitioning is RoundRobinPartitioning (with the numShufflePartitions). Otherwise, partitioning is a HashPartitioning (with the partition expressions and the numShufflePartitions).

partitioning is used when:

• BasicOperators execution planning strategy is executed (for a RebalancePartitions logical operator)

Query Planning¶

RebalancePartitions logical operators are planned by BasicOperators execution planning strategy (to ShuffleExchangeExec physical operators).