struct EnforceDistRequirementRewriter {
column_requirements: Vec<(HashSet<Column>, usize)>,
cur_level: usize,
}
Expand description
Implementation of the [TreeNodeRewriter
] trait which is responsible for rewriting
logical plans to enforce various requirement for distributed query.
Requirements enforced by this rewriter:
- Enforce column requirements for
LogicalPlan::Projection
nodes. Makes sure the required columns are available in the sub plan.
Fields§
§column_requirements: Vec<(HashSet<Column>, usize)>
only enforce column requirements after the expanding node in question,
meaning only for node with cur_level
<= level
will consider adding those column requirements
TODO(discord9): a simpler solution to track column requirements for merge scan
cur_level: usize
only apply column requirements >= cur_level
this is used to avoid applying column requirements that are not needed
for the current node, i.e. the node is not in the scope of the column requirements
i.e, for this plan:
Aggregate: min(t.number)
Projection: t.number
when on Projection
node, we don’t need to apply the column requirements of Aggregate
node
because the Projection
node is not in the scope of the Aggregate
node
Implementations§
Trait Implementations§
Auto Trait Implementations§
impl Freeze for EnforceDistRequirementRewriter
impl RefUnwindSafe for EnforceDistRequirementRewriter
impl Send for EnforceDistRequirementRewriter
impl Sync for EnforceDistRequirementRewriter
impl Unpin for EnforceDistRequirementRewriter
impl UnwindSafe for EnforceDistRequirementRewriter
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