pitrou commented on code in PR #765:
URL: https://github.com/apache/arrow-adbc/pull/765#discussion_r1238578210
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adbc.h:
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@@ -386,6 +413,54 @@ struct ADBC_EXPORT AdbcError {
/// \see AdbcConnectionGetObjects
#define ADBC_OBJECT_DEPTH_COLUMNS ADBC_OBJECT_DEPTH_ALL
+/// \defgroup adbc-table-statistics ADBC Statistic Types
+/// Standard statistic names for AdbcConnectionGetTableStatistics.
+/// @{
+
+/// \brief The dictionary-encoded name of the average byte width statistic.
+#define ADBC_STATISTIC_AVERAGE_BYTE_WIDTH_KEY 0
+/// \brief The average byte width statistic. The average size in bytes of a
+/// row in the column. Value type is float64.
+///
+/// For example, this is roughly the average length of a string for a string
+/// column.
+#define ADBC_STATISTIC_AVERAGE_BYTE_WIDTH_NAME "adbc.statistic.byte_width"
+/// \brief The dictionary-encoded name of the distinct value count statistic.
+#define ADBC_STATISTIC_DISTINCT_COUNT_KEY 1
+/// \brief The distinct value count (NDV) statistic. The number of distinct
+/// values in the column. Value type is uint64 (when not approximate) or
Review Comment:
AFAIU, Java doesn't really like unsigned integers, especially 64-bit. Would
it help to switch to int64?
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