Module schema 

Definitions and functions to create and manipulate kernel schema

Modules

derive_macro_utilsinternal-api

Utility traits that support the delta_kernel_derive::ToSchema macro.

Macros

lazy_schema_refinternal-api

Sugar for LazyLock::new(|| schema_ref! { ... }), yielding a lazy SchemaRef.

schemainternal-api

Builds a StructType from a JSON-shaped description that freely mixes literal structure with interpolated runtime values, in the spirit of serde_json::json!.

schema_refinternal-api

Sugar for Arc::new(schema! { ... }), yielding a SchemaRef. Convenient for the LazyLock<SchemaRef> statics that pervade the action and stats schemas.

try_schemainternal-api

Like [schema], but validates field names at every level of the schema (each struct, including nested ones, is built via StructType::try_new and yields DeltaResult<StructType>. Use when field names are runtime values that could duplicate in ways the macro cannot see.

Structs

ArrayType

ColumnDefault

A column-level default parsed from the CURRENT_DEFAULT metadata key of a StructField.

ColumnNamesAndTypesinternal-api

Helper for RowVisitor implementations

DecimalType

GeographyTypegeo-type-in-dev

Geography column type with an associated CRS and edge interpolation algorithm.

GeometryTypegeo-type-in-dev

A geometry column type with an associated coordinate reference system (CRS).

MapType

StructField

StructFieldIntoIter

An iterator that yields owned StructFields from a StructType.

StructFieldRefIter

An iterator that yields references to StructFields from a StructType.

StructType

A struct is used to represent both the top-level schema of the table as well as struct columns that contain nested columns.

StructTypeBuilder

Enums

ColumnMetadataKey

DataType

EdgeInterpolationAlgorithmgeo-type-in-dev

Algorithm used to interpolate edges between two vertices of a geography path.

MetadataColumnSpec

Enumeration of metadata columns recognized by Delta Kernel.

MetadataValue

PrimitiveType

Traits

ToSchemainternal-api

Converts a type to a Schema that represents that type. Derivable for struct types using the delta_kernel_derive::ToSchema derive macro.

ToSchemaFieldinternal-api

Converts field interpolation inputs in [schema!] and [try_schema!] to StructField.

Type Aliases

Schema

SchemaRef

SchemaStructPatchBuilder

A StructPatchBuilder whose emitted items are schema fields, lowered into an output StructType directly from an input schema via build.