jduo commented on a change in pull request #11982:
URL: https://github.com/apache/arrow/pull/11982#discussion_r785656628
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File path: format/FlightSql.proto
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@@ -867,6 +867,69 @@ enum SqlSupportsConvert {
SQL_CONVERT_VARCHAR = 19;
}
+/*
+ * Represents a request to retrieve information about data type supported ona
Flight SQL enabled backend.
+ * Used in the command member of FlightDescriptor for the following RPC calls:
+ * - GetSchema: return the schema of the query.
+ * - GetFlightInfo: execute the catalog metadata request.
+ *
+ * The returned schema will be:
+ * <
+ * type_name: utf8 not null (The name of the data type, for example:
VARCHAR, INTEGER, etc),
+ * data_type: int not null (The SQL data type),
Review comment:
The data_type field is standard for ODBC and JDBC for the ANSI data
types such as VARCHAR. This comment makes mentions of these being mapped from
ANSI codes:
https://github.com/aosm/iodbc/blob/d08b69dda97da494821a34ffb8aa56b4bac50b0f/iodbc/include/sql.h#L155
.
This can be a DBMS-specific type if it's a custom data type for the source.
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