lance_index::scalar::expression

Struct IndexedExpression

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pub struct IndexedExpression {
    pub scalar_query: Option<ScalarIndexExpr>,
    pub refine_expr: Option<Expr>,
}
Expand description

An indexed expression consists of a scalar index query with a post-scan filter

When a user wants to filter the data returned by a scan we may be able to use one or more scalar indices to reduce the amount of data we load from the disk.

For example, if a user provides the filter “x = 7”, and we have a scalar index on x, then we can possibly identify the exact row that the user desires with our index. A full-table scan can then turn into a take operation fetching the rows desired. This would create an IndexedExpression with a scalar_query but no refine.

If the user asked for “type = ‘dog’ && z = 3” and we had a scalar index on the “type” column then we could convert this to an indexed scan for “type=‘dog’” followed by an in-memory filter for z=3. This would create an IndexedExpression with both a scalar_query AND a refine.

Finally, if the user asked for “z = 3” and we do not have a scalar index on the “z” column then we must fallback to an IndexedExpression with no scalar_query and only a refine.

Two IndexedExpressions can be AND’d together. Each part is AND’d together. Two IndexedExpressions cannot be OR’d together unless both are scalar_query only or both are refine only An IndexedExpression cannot be negated if it has both a refine and a scalar_query

When an operation cannot be performed we fallback to the original expression-only representation

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§scalar_query: Option<ScalarIndexExpr>

The portion of the query that can be satisfied by scalar indices

§refine_expr: Option<Expr>

The portion of the query that cannot be satisfied by scalar indices

Trait Implementations§

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impl Debug for IndexedExpression

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl PartialEq for IndexedExpression

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fn eq(&self, other: &IndexedExpression) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for IndexedExpression

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