ExecutionContext

Struct ExecutionContext 

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pub struct ExecutionContext { /* private fields */ }
Expand description

Execution context for tracking table aliases and scope during query execution

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impl ExecutionContext

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pub fn new() -> Self

Create a new empty execution context

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pub fn register_alias(&mut self, alias: String, table_name: String)

Register a table alias

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pub fn resolve_alias(&self, name: &str) -> String

Resolve an alias to its actual table name Returns the alias itself if not found in the map

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pub fn is_alias(&self, name: &str) -> bool

Check if a name is a registered alias

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pub fn get_aliases(&self) -> HashMap<String, String>

Get a copy of all registered aliases

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pub fn resolve_column_index( &self, table: &DataTable, column_ref: &ColumnRef, ) -> Result<usize>

Resolve a column reference to its index in the table, handling aliases

This is the unified column resolution function that should be used by all SQL clauses (WHERE, SELECT, ORDER BY, GROUP BY) to ensure consistent alias resolution behavior.

Resolution strategy:

  1. If column_ref has a table_prefix (e.g., “t” in “t.amount”): a. Resolve the alias: t -> actual_table_name b. Try qualified lookup: “actual_table_name.amount” c. Fall back to unqualified: “amount”
  2. If column_ref has no prefix: a. Try simple column name lookup: “amount” b. Try as qualified name if it contains a dot: “table.column”

Trait Implementations§

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impl Clone for ExecutionContext

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fn clone(&self) -> ExecutionContext

Returns a duplicate 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 Debug for ExecutionContext

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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 Default for ExecutionContext

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fn default() -> Self

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

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

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Gets the TypeId of self. Read more
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where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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impl<T> From<T> for T

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