Struct datafusion::physical_plan::expressions::CaseExpr [−][src]
pub struct CaseExpr { /* fields omitted */ }
The CASE expression is similar to a series of nested if/else and there are two forms that can be used. The first form consists of a series of boolean “when” expressions with corresponding “then” expressions, and an optional “else” expression.
CASE WHEN condition THEN result [WHEN …] [ELSE result] END
The second form uses a base expression and then a series of “when” clauses that match on a literal value.
CASE expression WHEN value THEN result [WHEN …] [ELSE result] END
Implementations
impl CaseExpr
[src]
impl CaseExpr
[src]pub fn try_new(
expr: Option<Arc<dyn PhysicalExpr>>,
when_then_expr: &[(Arc<dyn PhysicalExpr>, Arc<dyn PhysicalExpr>)],
else_expr: Option<Arc<dyn PhysicalExpr>>
) -> Result<Self>
[src]
expr: Option<Arc<dyn PhysicalExpr>>,
when_then_expr: &[(Arc<dyn PhysicalExpr>, Arc<dyn PhysicalExpr>)],
else_expr: Option<Arc<dyn PhysicalExpr>>
) -> Result<Self>
Create a new CASE WHEN expression
pub fn expr(&self) -> &Option<Arc<dyn PhysicalExpr>>
[src]
Optional base expression that can be compared to literal values in the “when” expressions
pub fn when_then_expr(
&self
) -> &[(Arc<dyn PhysicalExpr>, Arc<dyn PhysicalExpr>)]
[src]
&self
) -> &[(Arc<dyn PhysicalExpr>, Arc<dyn PhysicalExpr>)]
One or more when/then expressions
pub fn else_expr(&self) -> Option<&Arc<dyn PhysicalExpr>>
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Optional “else” expression
Trait Implementations
impl PhysicalExpr for CaseExpr
[src]
impl PhysicalExpr for CaseExpr
[src]Auto Trait Implementations
impl !RefUnwindSafe for CaseExpr
impl !RefUnwindSafe for CaseExpr
impl !UnwindSafe for CaseExpr
impl !UnwindSafe for CaseExpr