Star Expression Contract

Star is a contract of leaf and named expressions that…​FIXME

package org.apache.spark.sql.catalyst.analysis

abstract class Star extends LeafExpression with NamedExpression {
  // only required methods that have no implementation
  def expand(input: LogicalPlan, resolver: Resolver): Seq[NamedExpression]
}
Table 1. Star Contract
Method Description

expand

Used exclusively when ResolveReferences logical resolution rule is requested to expand Star expressions in the following logical operators:

Table 2. Stars
Star Description

ResolvedStar

UnresolvedRegex

UnresolvedStar

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