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core/src/main/java/org/apache/calcite/sql/dialect/KylinSqlDialect.java
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| /* | ||
| * 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.rel.type.RelDataType; | ||
| import org.apache.calcite.sql.SqlAlienSystemTypeNameSpec; | ||
| import org.apache.calcite.sql.SqlCall; | ||
| import org.apache.calcite.sql.SqlDataTypeSpec; | ||
| import org.apache.calcite.sql.SqlDialect; | ||
| import org.apache.calcite.sql.SqlNode; | ||
| import org.apache.calcite.sql.SqlOperator; | ||
| import org.apache.calcite.sql.SqlSyntax; | ||
| import org.apache.calcite.sql.SqlWriter; | ||
| import org.apache.calcite.sql.fun.SqlStdOperatorTable; | ||
| import org.apache.calcite.sql.fun.SqlSubstringFunction; | ||
| import org.apache.calcite.sql.parser.SqlParserPos; | ||
| import org.apache.calcite.sql.type.BasicSqlType; | ||
| import org.apache.calcite.util.RelToSqlConverterUtil; | ||
|
|
||
| import org.checkerframework.checker.nullness.qual.Nullable; | ||
|
|
||
| /** | ||
| * A <code>SqlDialect</code> implementation for the Apache Hive database. | ||
| */ | ||
| public class KylinSqlDialect extends SqlDialect { | ||
| public static final SqlDialect.Context DEFAULT_CONTEXT = SqlDialect.EMPTY_CONTEXT | ||
| .withDatabaseProduct(DatabaseProduct.KYLIN) | ||
| .withIdentifierQuoteString("\""); | ||
|
|
||
| public static final SqlDialect DEFAULT = new CalciteSqlDialect(DEFAULT_CONTEXT); | ||
|
|
||
| /** | ||
| * Creates a HiveSqlDialect. | ||
| */ | ||
| public KylinSqlDialect(Context context) { | ||
| super(context); | ||
| } | ||
|
|
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| @Override public void unparseOffsetFetch(SqlWriter writer, @Nullable SqlNode offset, | ||
| @Nullable SqlNode fetch) { | ||
| unparseFetchUsingLimit(writer, offset, fetch); | ||
| } | ||
|
|
||
| @Override public void unparseCall(final SqlWriter writer, final SqlCall call, | ||
| final int leftPrec, final int rightPrec) { | ||
| switch (call.getKind()) { | ||
| case POSITION: | ||
| final SqlWriter.Frame frame = writer.startFunCall("INSTR"); | ||
| writer.sep(","); | ||
| call.operand(1).unparse(writer, leftPrec, rightPrec); | ||
| writer.sep(","); | ||
| call.operand(0).unparse(writer, leftPrec, rightPrec); | ||
| if (3 == call.operandCount()) { | ||
| throw new RuntimeException("3rd operand Not Supported for Function INSTR in Hive"); | ||
| } | ||
| writer.endFunCall(frame); | ||
| break; | ||
| case MOD: | ||
| SqlOperator op = SqlStdOperatorTable.PERCENT_REMAINDER; | ||
| SqlSyntax.BINARY.unparse(writer, op, call, leftPrec, rightPrec); | ||
| break; | ||
| case TRIM: | ||
| RelToSqlConverterUtil.unparseHiveTrim(writer, call, leftPrec, rightPrec); | ||
| break; | ||
| case OTHER_FUNCTION: | ||
| if (call.getOperator() instanceof SqlSubstringFunction) { | ||
| final SqlWriter.Frame funCallFrame = writer.startFunCall(call.getOperator().getName()); | ||
| call.operand(0).unparse(writer, leftPrec, rightPrec); | ||
| writer.sep(",", true); | ||
| call.operand(1).unparse(writer, leftPrec, rightPrec); | ||
| if (3 == call.operandCount()) { | ||
| writer.sep(",", true); | ||
| call.operand(2).unparse(writer, leftPrec, rightPrec); | ||
| } | ||
| writer.endFunCall(funCallFrame); | ||
| } else { | ||
| super.unparseCall(writer, call, leftPrec, rightPrec); | ||
| } | ||
| break; | ||
| default: | ||
| super.unparseCall(writer, call, leftPrec, rightPrec); | ||
| } | ||
| } | ||
|
|
||
| @Override public boolean supportsCharSet() { | ||
| return false; | ||
| } | ||
|
|
||
| @Override public boolean supportsGroupByWithRollup() { | ||
| return true; | ||
| } | ||
|
|
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| @Override public boolean supportsGroupByWithCube() { | ||
| return true; | ||
| } | ||
|
|
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| @Override public boolean supportsApproxCountDistinct() { | ||
| return true; | ||
| } | ||
|
|
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| @Override public boolean supportsNestedAggregations() { | ||
| return false; | ||
| } | ||
|
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| @Override public @Nullable SqlNode getCastSpec(final RelDataType type) { | ||
| if (type instanceof BasicSqlType) { | ||
| switch (type.getSqlTypeName()) { | ||
| case INTEGER: | ||
| SqlAlienSystemTypeNameSpec typeNameSpec = new SqlAlienSystemTypeNameSpec( | ||
| "INT", type.getSqlTypeName(), SqlParserPos.ZERO); | ||
| return new SqlDataTypeSpec(typeNameSpec, SqlParserPos.ZERO); | ||
| default: | ||
| break; | ||
| } | ||
| } | ||
| return super.getCastSpec(type); | ||
| } | ||
| } |