UpdateMetadataValues

Replacement tags for the column. Omit or send null to leave the existing tags untouched; send {} to clear them; send a populated object to replace them wholesale. Publisher-supplied free-form metadata for the column, as a JSON object. Keys must be non-empty strings (≤ 256 chars) with no leading whitespace or dot and none of the characters / \ : > < | ? " *; keys are unique case-insensitively. Values may be any JSON-compatible type. A single column's tags object serialised as UTF-8 JSON must be at most 10 KiB.

The new human-readable label for the column

The new unit ID for the column