JoinStrategyHint¶
JoinStrategyHint is an abstraction of join hints.
| JoinStrategyHint | displayName | hintAliases |
|---|---|---|
| BROADCAST | broadcast | BROADCAST, BROADCASTJOIN, MAPJOIN |
| NO_BROADCAST_HASH | no_broadcast_hash | |
| SHUFFLE_HASH | shuffle_hash | SHUFFLE_HASH |
| SHUFFLE_MERGE | merge | SHUFFLE_MERGE, MERGE, MERGEJOIN |
| SHUFFLE_REPLICATE_NL | shuffle_replicate_nl | SHUFFLE_REPLICATE_NL |
JoinStrategyHint is resolved using ResolveJoinStrategyHints logical resolution rule.
sealed abstract class
JoinStrategyHint is a Scala sealed abstract class which means that all possible implementations (JoinStrategyHints) are all in the same compilation unit (file).
Contract¶
displayName¶
displayName: String
hintAliases¶
hintAliases: Set[String]
Used when ResolveJoinStrategyHints logical resolution rule is executed