pub struct ProjectionPushdown;
Expand description

Pushes projections down through other operators.

Implementations

Pushes the desired_projection down through relation.

This action transforms relation to a MirRelationExpr equivalent to relation.project(desired_projection).

desired_projection is expected to consist of unique columns.

When we push the desired_value_projection at value, the columns returned by Get(get_id) will change, so we need to permute Projects around Get(get_id).

Trait Implementations

Formats the value using the given formatter. Read more

Transform a relation into a functionally equivalent relation.

A string describing the transform. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

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Calls U::from(self).

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Wrap the input message T in a tonic::Request

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Initializes a with the given initializer. Read more

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The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

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