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ColumnMetadataKey

delta_kernel::schema

Enum ColumnMetadataKey 

Source 
pub enum ColumnMetadataKey {

Show 14 variants    ColumnMappingId,
    ColumnMappingPhysicalName,
    ColumnMappingNestedIds,
    ParquetFieldId,
    ParquetFieldNestedIds,
    GenerationExpression,
    CurrentDefault,
    IdentityStart,
    IdentityStep,
    IdentityHighWaterMark,
    IdentityAllowExplicitInsert,
    InternalColumn,
    Invariants,
    MetadataSpec,

}

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ColumnMappingId

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ColumnMappingPhysicalName

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ColumnMappingNestedIds

Parquet field IDs for the synthesized element / key / value fields of an Array or Map. Stored on the nearest ancestor StructField as a JSON object whose keys are dot-paths rooted at that field’s name.

§Example: list-in-map

For m: map<int, array<int>> and the key/value/element fields having field ids 100/101/102, the metadata on m should be:

{
  "delta.columnMapping.nested.ids": {
    "m.key":           100,
    "m.value":         101,
    "m.value.element": 102
  }
}
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ParquetFieldId

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ParquetFieldNestedIds

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GenerationExpression

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CurrentDefault

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IdentityStart

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IdentityStep

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IdentityHighWaterMark

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IdentityAllowExplicitInsert

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InternalColumn

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Invariants

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MetadataSpec

Trait Implementations§

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impl AsRef<str> for ColumnMetadataKey

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fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.
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impl Debug for ColumnMetadataKey

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

Formats the value using the given formatter. Read more

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