Struct ExprHumanizerExt

pub struct ExprHumanizerExt<'a> {
    items: BTreeMap<GlobalId, TransientItem>,
    inner: &'a dyn ExprHumanizer,
}

An ExprHumanizer that extends the inner instance with shadow items that are reported as present, even though they might not exist in inner.

Fields

items: BTreeMap<GlobalId, TransientItem>

A map of custom items that might not exist in the backing inner humanizer, but are reported as present by this humanizer instance.

inner: &'a dyn ExprHumanizer

The inner humanizer used to resolve queries for GlobalId values not present in the items map.

Implementations

impl<'a> ExprHumanizerExt<'a>

pub fn new( items: BTreeMap<GlobalId, TransientItem>, inner: &'a dyn ExprHumanizer, ) -> Self

Trait Implementations

impl<'a> Debug for ExprHumanizerExt<'a>

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

Formats the value using the given formatter.

impl<'a> ExprHumanizer for ExprHumanizerExt<'a>

fn humanize_id(&self, id: GlobalId) -> Option<String>

Attempts to return a human-readable string for the relation identified by id.

fn humanize_id_unqualified(&self, id: GlobalId) -> Option<String>

Same as above, but without qualifications, e.g., only foo for materialize.public.foo.

fn humanize_id_parts(&self, id: GlobalId) -> Option<Vec<String>>

Like Self::humanize_id, but returns the constituent parts of the name as individual elements.

fn humanize_scalar_type(&self, ty: &ScalarType, postgres_compat: bool) -> String

Returns a human-readable name for the specified scalar type. Used in, e.g., EXPLAIN and error msgs, in which case exact Postgres compatibility is less important than showing as much detail as possible. Also used in pg_typeof, where Postgres compatibility is more important.

fn column_names_for_id(&self, id: GlobalId) -> Option<Vec<String>>

Returns a vector of column names for the relation identified by id.

fn humanize_column(&self, id: GlobalId, column: usize) -> Option<String>

Returns the #column name for the relation identified by id.

fn id_exists(&self, id: GlobalId) -> bool

Returns whether the specified id exists.

fn humanize_column_type( &self, typ: &ColumnType, postgres_compat: bool, ) -> String

Returns a human-readable name for the specified column type. Used in, e.g., EXPLAIN and error msgs, in which case exact Postgres compatibility is less important than showing as much detail as possible. Also used in pg_typeof, where Postgres compatibility is more important.