davidhcoe commented on code in PR #697: URL: https://github.com/apache/arrow-adbc/pull/697#discussion_r1220836416
########## csharp/src/Apache.Arrow.Adbc/Core/StandardSchemas.cs: ########## @@ -0,0 +1,191 @@ +/* + * 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 + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * 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. + */ + +using System; +using System.Collections.Generic; +using System.Linq; +using Apache.Arrow.Types; + +namespace Apache.Arrow.Adbc.Core +{ + /// <summary> + /// The standard schemas + /// </summary> + public sealed class StandardSchemas + { + private StandardSchemas() + { + throw new InvalidOperationException("Do not instantiate this class"); + } + + private static readonly ArrowType INT16 = new Int16Type(); + private static readonly ArrowType INT32 = new Int32Type(); + private static readonly ArrowType INT64 = new Int64Type(); + private static readonly ArrowType UINT32 = new UInt32Type(); + + /// <summary> + /// The schema of the result set of <see cref="AdbcConnection.GetInfo(int[])"/>}. + /// </summary> + public static readonly Schema GetInfoSchema = + new Schema( + new List<Field>() + { + new Field("info_name", UInt32Type.Default, false), + new Field( + "info_value", + new UnionType( + new List<Field>() + { + new Field("string_value", StringType.Default, true), + new Field("bool_value", BooleanType.Default, true), + new Field("int64_value", Int64Type.Default, true), + new Field("int32_bitmask", Int32Type.Default, true), + new Field( + "string_list", + new ListType( + new Field("item", StringType.Default, true) + ), + false + ), + new Field( + "int32_to_int32_list_map", + new ListType( + new Field("entries", new StructType( + new List<Field>() + { + new Field("key", Int32Type.Default, false), + new Field("value", Int32Type.Default, true), + } + ), false) + ), + true + ) + }, + // TBD if this line is the best approach but its a good one-liner + new int[] {0, 1, 2, 3, 4, 5}.SelectMany(BitConverter.GetBytes).ToArray(), + UnionMode.Dense), + true) + }, + metadata: null + ); + + public static readonly Schema TableTypesSchema = new Schema( + new List<Field>() + { + new Field("table_type", StringType.Default, false) + }, + metadata: null + ); + + public static readonly List<Field> UsageSchema = new List<Field>() + { + new Field("fk_catalog", StringType.Default, true), + new Field("fk_db_schema", StringType.Default, true), + new Field("fk_table", StringType.Default, false), + new Field("fk_column_name", StringType.Default, false) + }; + + public static readonly List<Field> ConstraintSchema = new List<Field>() + { + new Field("constraint_name", StringType.Default, false), + new Field("constraint_type", StringType.Default, false), + new Field("constraint_column_usage", + new ListType( + new Field("item", StringType.Default, true) + ), + false + ), + new Field("constraint_column_usage", + new ListType( + new Field("item", new StructType(UsageSchema), true) + ), + false + ), + }; + + public static readonly List<Field> ColumnSchema = + new List<Field>() + { + new Field("column_name", StringType.Default, false), + new Field("ordinal_position", Int32Type.Default, true), + new Field("remarks", StringType.Default, true), + new Field("xdbc_data_type", Int16Type.Default, true), + new Field("xdbc_type_name", StringType.Default, true), + new Field("xdbc_column_size", Int32Type.Default, true), + new Field("xdbc_decimal_digits", Int16Type.Default, true), + new Field("xdbc_num_prec_radix", Int16Type.Default, true), + new Field("xdbc_nullable", Int16Type.Default, true), + new Field("xdbc_column_def", StringType.Default, true), + new Field("xdbc_sql_data_type", Int16Type.Default, true), + new Field("xdbc_datetime_sub", Int16Type.Default, true), + new Field("xdbc_char_octet_length", Int32Type.Default, true), + new Field("xdbc_is_nullable", StringType.Default, true), + new Field("xdbc_scope_catalog", StringType.Default, true), + new Field("xdbc_scope_schema", StringType.Default, true), + new Field("xdbc_scope_table", StringType.Default, true), + new Field("xdbc_is_autoincrement", StringType.Default, true), + new Field("xdbc_is_generatedcolumn", StringType.Default, true) + }; + + public static readonly List<Field> TableSchema = new List<Field>() { + new Field("table_name", StringType.Default, false, null), + new Field("table_type", StringType.Default, false, null), + new Field( + "table_columns", + new ListType( + new Field("item", new StructType(ColumnSchema), true) + ), + false + ), + new Field( + "table_constraints", + new ListType( + new Field("item", new StructType(ConstraintSchema), true) + ), + false + ) + }; + + public static readonly List<Field> DbSchemaSchema = new List<Field>() + { + new Field("db_schema_name", StringType.Default, false, null), + new Field( + "db_schema_tables", + new ListType( + new Field("item", new StructType(TableSchema), true) + ), + false + ) + }; + + public static readonly Schema GET_OBJECTS_SCHEMA = new Schema( Review Comment: fixed -- This is an automated message from the Apache Git Service. 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