spark技术分享ResolveAliases Logical Resolution Rule
ResolveAliases is a logical resolution rule that the logical query plan analyzer uses to FIXME in an entire logical query plan.
Technically, ResolveAliases is just a Catalyst rule for transforming logical plans, i.e. Rule[LogicalPlan].
ResolveAliases is part of Resolution fixed-point batch of rules.
|
Note
|
ResolveAliases is a Scala object inside Analyzer class.
|
|
1 2 3 4 5 6 7 |
import spark.sessionState.analyzer.ResolveAliases // FIXME Using ResolveAliases rule |
Applying ResolveAliases to Logical Plan — apply Method
|
1 2 3 4 5 |
apply(plan: LogicalPlan): LogicalPlan |
|
Note
|
apply is part of Rule Contract to apply a rule to a logical plan.
|
apply…FIXME
