pitrou commented on code in PR #765:
URL: https://github.com/apache/arrow-adbc/pull/765#discussion_r1238575003
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adbc.h:
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@@ -1362,6 +1743,72 @@ AdbcStatusCode AdbcConnectionGetTableSchema(struct
AdbcConnection* connection,
struct ArrowSchema* schema,
struct AdbcError* error);
+/// \brief Get statistics about the data distribution of table(s).
+///
+/// The result is an Arrow dataset with the following schema:
+///
+/// | Field Name | Field Type |
+/// |--------------------------|----------------------------------|
+/// | catalog_name | utf8 |
+/// | catalog_db_schemas | list<DB_SCHEMA_SCHEMA> |
+///
+/// DB_SCHEMA_SCHEMA is a Struct with fields:
+///
+/// | Field Name | Field Type |
+/// |--------------------------|----------------------------------|
+/// | db_schema_name | utf8 |
+/// | db_schema_functions | list<STATISTICS_SCHEMA> |
+///
+/// STATISTICS_SCHEMA is a Struct with fields:
+///
+/// | Field Name | Field Type | Comments |
+/// |--------------------------|----------------------------------| -------- |
+/// | table_name | utf8 not null | |
+/// | column_name | utf8 | (1) |
+/// | statistic_name | dictionary<int16, utf8> not null | (2) |
+/// | statistic_value | VALUE_SCHEMA not null | |
+/// | statistic_is_approximate | bool not null | (3) |
+///
+/// 1. If null, then the statistic applies to the entire table.
+/// 2. A dictionary-encoded statistic name. Values in [0, 1024) are
+/// reserved for ADBC use. Other values are free for
+/// implementation-specific statistics. For the names and
+/// definitions of predefined statistic types, see \ref
+/// adbc-table-statistics.
Review Comment:
This is a bit weird. Does it mean the dictionary _must_ have more than 1024
entries if impl-specific stats are desired?
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