Add API for Creating Variant Values

arrow-schema/src/error.rs

@@ -60,8 +60,6 @@ pub enum ArrowError {
     DictionaryKeyOverflowError,
     /// Error when the run end index in a REE array is bigger than the array length
     RunEndIndexOverflowError,
-    /// Error during Variant operations in `arrow-variant`.
-    VariantError(String),
 }
 
 impl ArrowError {
@@ -128,9 +126,6 @@ impl Display for ArrowError {
             ArrowError::RunEndIndexOverflowError => {
                 write!(f, "Run end encoded array index overflow error")
             }
-            ArrowError::VariantError(desc) => {
-                write!(f, "Variant error: {desc}")
-            }
         }
     }
 }

arrow-schema/src/extension/canonical/mod.rs

@@ -37,8 +37,6 @@ mod uuid;
 pub use uuid::Uuid;
 mod variable_shape_tensor;
 pub use variable_shape_tensor::{VariableShapeTensor, VariableShapeTensorMetadata};
-mod variant;
-pub use variant::Variant;
 
 use crate::{ArrowError, Field};
 
@@ -79,9 +77,6 @@ pub enum CanonicalExtensionType {
     ///
     /// <https://arrow.apache.org/docs/format/CanonicalExtensions.html#bit-boolean>
     Bool8(Bool8),
-
-    /// The extension type for `Variant`.
-    Variant(Variant),
 }
 
 impl TryFrom<&Field> for CanonicalExtensionType {
@@ -98,7 +93,6 @@ impl TryFrom<&Field> for CanonicalExtensionType {
                 Uuid::NAME => value.try_extension_type::<Uuid>().map(Into::into),
                 Opaque::NAME => value.try_extension_type::<Opaque>().map(Into::into),
                 Bool8::NAME => value.try_extension_type::<Bool8>().map(Into::into),
-                Variant::NAME => value.try_extension_type::<Variant>().map(Into::into),
                 _ => Err(ArrowError::InvalidArgumentError(format!("Unsupported canonical extension type: {name}"))),
             },
             // Name missing the expected prefix
@@ -146,9 +140,3 @@ impl From<Bool8> for CanonicalExtensionType {
         CanonicalExtensionType::Bool8(value)
     }
 }
-
-impl From<Variant> for CanonicalExtensionType {
-    fn from(value: Variant) -> Self {
-        CanonicalExtensionType::Variant(value)
-    }
-}

arrow-variant/Cargo.toml

@@ -18,7 +18,7 @@
 [package]
 name = "arrow-variant"
 version = { workspace = true }
-description = "JSON to Arrow Variant conversion utilities"
+description = "Rust API for reading/writing Apache Parquet Variant values"
 homepage = { workspace = true }
 repository = { workspace = true }
 authors = { workspace = true }