Struct WindowFunctionTail 

pub struct WindowFunctionTail {
    pub from_first_last: Option<FromFirstLast>,
    pub null_treatment: Option<NullTreatment>,
}

The MySQL window-function post-) argument tail (SQL:2016): [FROM {FIRST | LAST}] [{RESPECT | IGNORE} NULLS], written between a null-treatment window function’s argument ) and its OVER clause.

Both clauses are independently optional and appear in this fixed order (the reverse order is a mysql:8 ER_PARSE_ERROR); the struct is only constructed when at least one is present, so a FunctionCall::window_tail of Some always carries a clause. The NullTreatment value is reused from the in-parenthesis DuckDB form — only its surface position differs (post-) here, in-paren there), which is why this is a separate field rather than a shared one.

Fields

from_first_last: Option<FromFirstLast>

FROM FIRST / FROM LAST — which end of the frame NTH_VALUE counts its Nth row from. None when unwritten. On mysql:8 only FROM FIRST is accepted (and only on NTH_VALUE); FROM LAST is grammar-admitted but feature-rejected (ER_NOT_SUPPORTED_YET, 1235), so the MySQL parser never produces FromFirstLast::Last.

null_treatment: Option<NullTreatment>

RESPECT NULLS / IGNORE NULLS — the post-) null treatment. None when unwritten. On mysql:8 only RESPECT NULLS is accepted; IGNORE NULLS is grammar-admitted but feature-rejected (ER_NOT_SUPPORTED_YET, 1235), so the MySQL parser never produces NullTreatment::IgnoreNulls in this position.

Trait Implementations

impl Clone for WindowFunctionTail

fn clone(&self) -> WindowFunctionTail

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for WindowFunctionTail

impl Debug for WindowFunctionTail

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for WindowFunctionTail

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for WindowFunctionTail

impl Hash for WindowFunctionTail

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for WindowFunctionTail

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for WindowFunctionTail

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for WindowFunctionTail