Module datafusion_optimizer::utils

Utility functions leveraged by the query optimizer rules

Structs

• NamePreserver
  Handles ensuring the name of rewritten expressions is not changed.
• SavedName
  If the name of an expression is remembered, it will be preserved when rewriting the expression

Functions

• add_filterDeprecated
  returns a new LogicalPlan that wraps plan in a LogicalPlan::Filter with its predicate be all predicates ANDed.
• conjunctionDeprecated
  Combines an array of filter expressions into a single filter expression consisting of the input filter expressions joined with logical AND.
• disjunctionDeprecated
  Combines an array of filter expressions into a single filter expression consisting of the input filter expressions joined with logical OR.
• find_join_exprsDeprecated
  Looks for correlating expressions: for example, a binary expression with one field from the subquery, and one not in the subquery (closed upon from outer scope)
• log_plan
  Log the plan in debug/tracing mode after some part of the optimizer runs
• merge_schemaDeprecated
  merge inputs schema into a single schema.
• only_or_errDeprecated
  Returns the first (and only) element in a slice, or an error
• optimize_childrenDeprecated
  Convenience rule for writing optimizers: recursively invoke optimize on plan’s children and then return a node of the same type. Useful for optimizer rules which want to leave the type of plan unchanged but still apply to the children. This also handles the case when the plan is a LogicalPlan::Explain.
• split_binaryDeprecated
  Splits an binary operator tree Expr such as A <OP> B <OP> C => [A, B, C]
• split_binary_ownedDeprecated
  Splits an owned binary operator tree Expr such as A <OP> B <OP> C => [A, B, C]
• split_conjunctionDeprecated
  Splits a conjunctive Expr such as A AND B AND C => [A, B, C]
• split_conjunction_ownedDeprecated
  Splits an owned conjunctive Expr such as A AND B AND C => [A, B, C]