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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2019/10/22 01:26:15 UTC
[GitHub] [calcite] danny0405 commented on a change in pull request #1524:
[CALCITE-3416] SQL Dialects DEFAULTs should be more extensible
danny0405 commented on a change in pull request #1524: [CALCITE-3416] SQL Dialects DEFAULTs should be more extensible
URL: https://github.com/apache/calcite/pull/1524#discussion_r337304888
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File path: core/src/main/java/org/apache/calcite/sql/dialect/SqlDialectContexts.java
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@@ -0,0 +1,197 @@
+/*
+ * 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.
+ */
+package org.apache.calcite.sql.dialect;
+
+import org.apache.calcite.avatica.util.Casing;
+import org.apache.calcite.config.NullCollation;
+import org.apache.calcite.rel.type.RelDataTypeSystem;
+import org.apache.calcite.rel.type.RelDataTypeSystemImpl;
+import org.apache.calcite.sql.SqlDialect;
+import org.apache.calcite.sql.type.SqlTypeName;
+
+/**
+ * Pre-defined builders of {@link SqlDialect.Context} for all kinds of sql dialects.
+ *
+ * <p>To add a new {@link SqlDialect}, add a {@link SqlDialect.Context} instance first
+ * in this class and reference it in the {@link SqlDialect} sub-class.
+ * Take {@link MysqlSqlDialect} for a reference.
+ */
+public abstract class SqlDialectContexts {
+ //~ Static fields/initializers ---------------------------------------------
+
+ public static final SqlDialect.Context EMPTY = SqlDialect.EMPTY_CONTEXT;
+
+ public static final SqlDialect.Context MSSQL = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.MSSQL)
+ .withIdentifierQuoteString("[")
+ .withCaseSensitive(false)
+ .withNullCollation(NullCollation.LOW);
+
+ public static final SqlDialect.Context H2 = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.H2)
+ .withIdentifierQuoteString("\"");
+
+ public static final SqlDialect.Context ANSI = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.UNKNOWN)
+ .withIdentifierQuoteString("`");
+
+ public static final SqlDialect.Context DERBY = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.DERBY);
+
+ public static final SqlDialect.Context SYBASE = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.SYBASE);
+
+ public static final SqlDialect.Context TERADATA = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.TERADATA)
+ .withIdentifierQuoteString("\"");
+
+ /** OracleDB type system. */
+ private static final RelDataTypeSystem ORACLE_TYPE_SYSTEM =
+ new RelDataTypeSystemImpl() {
+ @Override public int getMaxPrecision(SqlTypeName typeName) {
+ switch (typeName) {
+ case VARCHAR:
+ // Maximum size of 4000 bytes for varchar2.
+ return 4000;
+ default:
+ return super.getMaxPrecision(typeName);
+ }
+ }
+ };
+
+ public static final SqlDialect.Context ORACLE = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.ORACLE)
+ .withIdentifierQuoteString("\"")
+ .withDataTypeSystem(ORACLE_TYPE_SYSTEM);
+
+ public static final SqlDialect.Context VERTICA = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.VERTICA)
+ .withIdentifierQuoteString("\"")
+ .withUnquotedCasing(Casing.UNCHANGED);
+
+ public static final SqlDialect.Context ACCESS = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.ACCESS)
+ .withIdentifierQuoteString("\"");
+
+ public static final SqlDialect.Context CALCITE = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.CALCITE)
+ .withIdentifierQuoteString("\"");
+
+ public static final SqlDialect.Context SPARK = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.SPARK)
+ .withNullCollation(NullCollation.LOW);
+
+ public static final SqlDialect.Context PHOENIX = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.PHOENIX)
+ .withIdentifierQuoteString("\"");
+
+ public static final SqlDialect.Context SNOWFLAKE = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.SNOWFLAKE)
+ .withIdentifierQuoteString("\"")
+ .withUnquotedCasing(Casing.TO_UPPER);
+
+ public static final SqlDialect.Context HSQLDB = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.HSQLDB);
+
+ public static final SqlDialect.Context INGRES = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.INGRES);
+
+ public static final SqlDialect.Context PARACCEL = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.PARACCEL)
+ .withIdentifierQuoteString("\"");
+
+ public static final SqlDialect.Context NETEZZA = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.NETEZZA)
+ .withIdentifierQuoteString("\"");
+
+ public static final SqlDialect.Context INTERBASE = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.INTERBASE);
+
+ public static final SqlDialect.Context INFOBRIGHT = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.INFOBRIGHT)
+ .withIdentifierQuoteString("`");
+
+ /** PostgreSQL type system. */
+ private static final RelDataTypeSystem POSTGRESQL_TYPE_SYSTEM =
+ new RelDataTypeSystemImpl() {
+ @Override public int getMaxPrecision(SqlTypeName typeName) {
+ switch (typeName) {
+ case VARCHAR:
+ // From htup_details.h in postgresql:
+ // MaxAttrSize is a somewhat arbitrary upper limit on the declared size of
+ // data fields of char(n) and similar types. It need not have anything
+ // directly to do with the *actual* upper limit of varlena values, which
+ // is currently 1Gb (see TOAST structures in postgres.h). I've set it
+ // at 10Mb which seems like a reasonable number --- tgl 8/6/00. */
+ return 10 * 1024 * 1024;
+ default:
+ return super.getMaxPrecision(typeName);
+ }
+ }
+ };
+
+ public static final SqlDialect.Context POSTGRESQL = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.POSTGRESQL)
+ .withIdentifierQuoteString("\"")
+ .withUnquotedCasing(Casing.TO_LOWER)
+ .withDataTypeSystem(POSTGRESQL_TYPE_SYSTEM);
+
+ public static final SqlDialect.Context REDSHIFT = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.REDSHIFT)
+ .withIdentifierQuoteString("\"")
+ .withQuotedCasing(Casing.TO_LOWER)
+ .withUnquotedCasing(Casing.TO_LOWER)
+ .withCaseSensitive(false);
+
+ public static final SqlDialect.Context FIREBIRD = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.FIREBIRD);
+
+ public static final SqlDialect.Context MYSQL = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.MYSQL)
+ .withIdentifierQuoteString("`")
+ .withUnquotedCasing(Casing.UNCHANGED)
+ .withNullCollation(NullCollation.LOW);
+
+ public static final SqlDialect.Context DB2 = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.DB2);
+
+ public static final SqlDialect.Context NEOVIEW = SqlDialect.EMPTY_CONTEXT
+ .withDatabaseProduct(SqlDialect.DatabaseProduct.NEOVIEW);
+
+ public static final SqlDialect.Context BIG_QUERY = SqlDialect.EMPTY_CONTEXT
Review comment:
Thanks, i just want to keep the name same as `SqlDialect.DatabaseProduct.BIG_QUERY`.
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