rename

Signed-off-by: jayzhan211 <[email protected]>

datafusion/expr-common/src/signature.rs

@@ -412,7 +412,7 @@ impl Signature {
         }
     }
 
-    pub fn zero_arg(volatility: Volatility) -> Self {
+    pub fn nullary(volatility: Volatility) -> Self {
         Signature {
             type_signature: TypeSignature::NullAry,
             volatility,

datafusion/functions-window/src/cume_dist.rs

@@ -49,7 +49,7 @@ pub struct CumeDist {
 impl CumeDist {
     pub fn new() -> Self {
         Self {
-            signature: Signature::zero_arg(Volatility::Immutable),
+            signature: Signature::nullary(Volatility::Immutable),
         }
     }
 }

datafusion/functions-window/src/rank.rs

@@ -74,7 +74,7 @@ impl Rank {
     pub fn new(name: String, rank_type: RankType) -> Self {
         Self {
             name,
-            signature: Signature::zero_arg(Volatility::Immutable),
+            signature: Signature::nullary(Volatility::Immutable),
             rank_type,
         }
     }

datafusion/functions-window/src/row_number.rs

@@ -51,7 +51,7 @@ impl RowNumber {
     /// Create a new `row_number` function
     pub fn new() -> Self {
         Self {
-            signature: Signature::zero_arg(Volatility::Immutable),
+            signature: Signature::nullary(Volatility::Immutable),
         }
     }
 }

datafusion/functions/src/datetime/current_date.rs

@@ -44,7 +44,7 @@ impl Default for CurrentDateFunc {
 impl CurrentDateFunc {
     pub fn new() -> Self {
         Self {
-            signature: Signature::zero_arg(Volatility::Stable),
+            signature: Signature::nullary(Volatility::Stable),
             aliases: vec![String::from("today")],
         }
     }

datafusion/functions/src/datetime/current_time.rs

@@ -42,7 +42,7 @@ impl Default for CurrentTimeFunc {
 impl CurrentTimeFunc {
     pub fn new() -> Self {
         Self {
-            signature: Signature::zero_arg(Volatility::Stable),
+            signature: Signature::nullary(Volatility::Stable),
         }
     }
 }

datafusion/functions/src/datetime/now.rs

@@ -43,7 +43,7 @@ impl Default for NowFunc {
 impl NowFunc {
     pub fn new() -> Self {
         Self {
-            signature: Signature::zero_arg(Volatility::Stable),
+            signature: Signature::nullary(Volatility::Stable),
             aliases: vec!["current_timestamp".to_string()],
         }
     }

datafusion/functions/src/math/pi.rs

@@ -41,7 +41,7 @@ impl Default for PiFunc {
 impl PiFunc {
     pub fn new() -> Self {
         Self {
-            signature: Signature::zero_arg(Volatility::Immutable),
+            signature: Signature::nullary(Volatility::Immutable),
         }
     }
 }

datafusion/functions/src/math/random.rs

@@ -42,7 +42,7 @@ impl Default for RandomFunc {
 impl RandomFunc {
     pub fn new() -> Self {
         Self {
-            signature: Signature::zero_arg(Volatility::Volatile),
+            signature: Signature::nullary(Volatility::Volatile),
         }
     }
 }