risingwave_frontend::optimizer::plan_expr_visitor::strong

Struct Strong

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pub struct Strong {
    null_columns: FixedBitSet,
}
Expand description

This utilities are with the same definition in calcite. Utilities for strong predicates. A predicate is strong (or null-rejecting) with regards to selected subset of inputs if it is UNKNOWN if all inputs in selected subset are UNKNOWN. By the way, UNKNOWN is just the boolean form of NULL.

Examples:

UNKNOWN is strong in [] (definitely null)

c = 1 is strong in [c] (definitely null if and only if c is null)

c IS NULL is not strong (always returns TRUE or FALSE, nevernull)

p1 AND p2 is strong in [p1, p2] (definitely null if either p1 is null or p2 is null)

p1 OR p2 is strong if p1 and p2 are strong

Fields§

§null_columns: FixedBitSet

Implementations§

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impl Strong

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fn new(null_columns: FixedBitSet) -> Self

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pub fn is_null(expr: &ExprImpl, null_columns: FixedBitSet) -> bool

Returns whether the analyzed expression will definitely return null if all of a given set of input columns are null. Note: we could not assume any null-related property for the input expression if is_null returns false

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fn is_input_ref_null(&self, input_ref: &InputRef) -> bool

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fn is_null_visit(&self, expr: &ExprImpl) -> bool

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fn is_null_function_call(&self, func_call: &FunctionCall) -> bool

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fn any_null(&self, func_call: &FunctionCall) -> bool

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fn all_null(&self, func_call: &FunctionCall) -> bool

Trait Implementations§

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impl Default for Strong

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fn default() -> Strong

Returns the “default value” for a type. Read more

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impl Freeze for Strong

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impl RefUnwindSafe for Strong

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impl Send for Strong

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impl Sync for Strong

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impl Unpin for Strong

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impl UnwindSafe for Strong

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