jcralmeida commented on a change in pull request #11982:
URL: https://github.com/apache/arrow/pull/11982#discussion_r774484082
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File path: format/FlightSql.proto
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@@ -867,6 +867,45 @@ 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,
+ * data_type: int not null,
+ * column_size: int,
+ * literal_prefix: utf8,
+ * literal_suffix: utf8,
+ * create_params: utf8
+ * nullable: int not null,
Review comment:
According to the documentation of the JDBC and ODBC this field has three
possible values
The possible values are:
```
typeNoNulls - does not allow NULL values
typeNullable - allows NULL values
typeNullableUnknown - nullability unknown
```
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