[GitHub] [arrow] lidavidm commented on a change in pull request #9368: [WIP] [POC] Flight SQL

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lidavidm commented on a change in pull request #9368:
URL: https://github.com/apache/arrow/pull/9368#discussion_r664142839



##########
File path: format/FlightSQL.proto
##########
@@ -0,0 +1,296 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = "proto3";
+
+option java_package = "org.apache.arrow.flight.sql.impl";
+package arrow.flight.protocol.sql;
+
+/*
+ * Represents a metadata request. Used in the command member of FlightDescriptor
+ * for the following RPC calls:
+ *  - GetSchema: return the schema of the query.
+ *  - GetFlightInfo: execute the query.
+ *
+ * The returned schema will be:
+ * <
+ *  info_name: utf8,
+ *  value: dense_union<string_value: string, int_value: int32, bigint_value: int64, int32_bitmask: int32>

Review comment:
       The typeIds aren't actually Flatbuffer type IDs - they're user-chosen sentinel values used to distinguish the cases on the wire; they're the tag of a tagged union. So they can be whatever. The actual types of the children are defined by the child fields, like so: https://github.com/apache/arrow/blob/41c4143992905cc85eb61a417cf9460c6db6b4df/java/vector/src/test/java/org/apache/arrow/vector/TestDenseUnionVector.java#L328-L343




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