Struct deltalake::datafusion::logical_expr::RecursiveQuery

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pub struct RecursiveQuery {
    pub name: String,
    pub static_term: Arc<LogicalPlan>,
    pub recursive_term: Arc<LogicalPlan>,
    pub is_distinct: bool,
}
Expand description

A variadic query operation, Recursive CTE.

§Recursive Query Evaluation

From the Postgres Docs:

  1. Evaluate the non-recursive term. For UNION (but not UNION ALL), discard duplicate rows. Include all remaining rows in the result of the recursive query, and also place them in a temporary working table.
  2. So long as the working table is not empty, repeat these steps:
  • Evaluate the recursive term, substituting the current contents of the working table for the recursive self-reference. For UNION (but not UNION ALL), discard duplicate rows and rows that duplicate any previous result row. Include all remaining rows in the result of the recursive query, and also place them in a temporary intermediate table.

  • Replace the contents of the working table with the contents of the intermediate table, then empty the intermediate table.

Fields§

§name: String

Name of the query

§static_term: Arc<LogicalPlan>

The static term (initial contents of the working table)

§recursive_term: Arc<LogicalPlan>

The recursive term (evaluated on the contents of the working table until it returns an empty set)

§is_distinct: bool

Should the output of the recursive term be deduplicated (UNION) or not (UNION ALL).

Trait Implementations§

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impl Clone for RecursiveQuery

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fn clone(&self) -> RecursiveQuery

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Hash for RecursiveQuery

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fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for RecursiveQuery

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for RecursiveQuery

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impl StructuralPartialEq for RecursiveQuery

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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fn from(t: T) -> T

Returns the argument unchanged.

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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