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JsonArray

datatypes::vectors::json::array

Struct JsonArray 

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pub struct JsonArray<'a> {
    inner: &'a ArrayRef,
}

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§inner: &'a ArrayRef

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impl JsonArray<'_>

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pub fn try_get_value(&self, i: usize) -> Result<Value>

Try to get the value (as a Value) at the index i.

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pub fn project_to_v2( &self, field: &Field, target: &DataType, ) -> Result<ArrayRef>

Projects a physical JSON2 array to a logical query type.

TODO(LFC) Supersede project_to_v2 to project_to.

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pub fn rewrite_to_v2( &self, field: &Field, logical_settings: &JsonSettings, target_layout: &JsonSettings, ) -> Result<ArrayRef>

Rewrites a JSON2 array from the current physical layout into the specified v2 physical layout.

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fn json2_values(&self) -> Result<Vec<Value>>

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pub fn widen_to(&self, expect: &DataType) -> Result<ArrayRef>

Normalizes a JSON2 array to the wider expect data type without losing information.

This is mainly used for write/flush-time JSON2 schema alignment:

  • fields missing from the source are filled with typed null arrays;
  • fields present in the source must also exist in expect;
  • fields present in both are widened recursively when their types differ.

Narrowing conversions and any other conversions that may lose information are rejected.

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fn widen_scalar_to(&self, to_type: &DataType) -> Result<ArrayRef>

Widens an array to the merged JSON2 physical type without losing information.

Supported conversions:

  • identical types are returned unchanged;
  • null arrays become typed null arrays;
  • concrete JSON values are encoded as JSONB when the target type is binary.

All other conversions are rejected.

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fn encode_variant(&self) -> Result<ArrayRef>

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pub fn project_to(&self, target: &DataType) -> Result<ArrayRef>

Projects this JSON array to target for query evaluation.

Unlike Self::widen_to, projection tolerates lossy conversions:

  • source fields not present in target are discarded;
  • fields missing from the source are filled with typed null arrays;
  • values incompatible with the target type become NULL.

Projection is applied recursively to structs and lists. Input nulls remain NULL. Errors unrelated to type incompatibility, such as invalid JSONB, are returned.

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fn project_values_to(&self, to_type: &DataType) -> Result<ArrayRef>

Trait Implementations§

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impl<'a> From<&'a Arc<dyn Array>> for JsonArray<'a>

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fn from(inner: &'a ArrayRef) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

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impl<'a> Freeze for JsonArray<'a>

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impl<'a> !RefUnwindSafe for JsonArray<'a>

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impl<'a> Send for JsonArray<'a>

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impl<'a> Sync for JsonArray<'a>

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impl<'a> Unpin for JsonArray<'a>

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impl<'a> UnsafeUnpin for JsonArray<'a>

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impl<'a> !UnwindSafe for JsonArray<'a>

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