Mapping

Example: "618d6339-2fa7-4dfd-9c7f-c0b12016639e"

The ID of the column, a UUID for non-system columns

Capitalized list of supported PyArrow datatypes outlined in https://arrow.apache.org/docs/python/api/datatypes.html.

Timestamp datatype is expected to be used with unit measured in "us" and timezone set to "UTC" inside of parquet column header schema or it won't be accepted; an example for PyArrow binding would look like this: pa.timestamp("us", tz="UTC")

UUID of the group this column belongs to. Null means ungrouped.

Publisher-supplied free-form metadata for the column, as a JSON object. Keys must be 1-100 chars and cannot contain leading whitespace or dot, or the characters / \ : > < | ? " *; keys are unique case-insensitively. Values may be any JSON-compatible type. A single tags object serialised as UTF-8 JSON must be at most 10 KiB.

The human-readable label used to identify the column

The ID of the column's unit

Default: []

Column groups within this version.

Example: "00633b08-165b-4dcb-bbae-0d3befa74c7e"

Unique identifier for the group.

When true, the group's direct member columns are excluded from wildcard queries unless include_hidden is set.

Default: "INHERIT"

Policy for columns in this group's zone that are absent from an update. Defaults to INHERIT, which adopts the nearest ancestor's explicit policy zone (USE_PREVIOUS at the root).

UUID of the parent group within the same block model. Null means top-level.

Effective missing-column policy after resolving against the stored parent chain. A group with INHERIT (or no policy) adopts the nearest ancestor's explicit policy zone, defaulting to USE_PREVIOUS when no ancestor sets one.

Publisher-supplied free-form metadata for the group, as a JSON object. Keys must be 1-100 chars and cannot contain leading whitespace or dot, or the characters / \ : > < | ? " *; keys are unique case-insensitively. Values may be any JSON-compatible type. A single tags object serialised as UTF-8 JSON must be at most 10 KiB.

Human-readable label for the group, unique across the parent group, or across top-level groups if no parent. They must be 1-100 chars and cannot contain leading whitespace or dot, or the characters / \ : > < | ? " *. Must not contain the qualified title separator ▸.