Github user hornn commented on a diff in the pull request: https://github.com/apache/incubator-hawq/pull/972#discussion_r85472163 --- Diff: pxf/pxf-jdbc/src/main/java/org/apache/hawq/pxf/plugins/jdbc/WhereSQLBuilder.java --- @@ -0,0 +1,140 @@ +package org.apache.hawq.pxf.plugins.jdbc; +/* + * 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. + */ + +import java.util.ArrayList; +import java.util.List; + +import org.apache.hawq.pxf.api.LogicalFilter; +import org.apache.hawq.pxf.plugins.jdbc.utils.DbProduct; +import org.apache.hawq.pxf.api.BasicFilter; +import org.apache.hawq.pxf.api.FilterParser; +import org.apache.hawq.pxf.api.io.DataType; +import org.apache.hawq.pxf.api.utilities.ColumnDescriptor; +import org.apache.hawq.pxf.api.utilities.InputData; + +/** + * Parse filter object generated by parent class {@link org.apache.hawq.pxf.plugins.jdbc.JdbcFilterBuilder}, + * and build WHERE statement. + * For Multiple filters , currently only support HDOP_AND . + * The unsupported Filter operation and LogicalOperation ,will return null statement. + * + */ +public class WhereSQLBuilder extends JdbcFilterBuilder { + private InputData inputData; + + public WhereSQLBuilder(InputData input) { + inputData = input; + } + + /** + * 1.check for LogicalOperator, Jdbc currently only support HDOP_AND. + * 2.and convert to BasicFilter List. + */ + private static List<BasicFilter> convertBasicFilterList(Object filter, List<BasicFilter> returnList) throws UnsupportedFilterException { + if (returnList == null) + returnList = new ArrayList<>(); + if (filter instanceof BasicFilter) { + returnList.add((BasicFilter) filter); + return returnList; + } + LogicalFilter lfilter = (LogicalFilter) filter; + if (lfilter.getOperator() != FilterParser.LogicalOperation.HDOP_AND) + throw new UnsupportedFilterException("unsupported LogicalOperation : " + lfilter.getOperator()); + for (Object f : lfilter.getFilterList()) { + returnList = convertBasicFilterList(f, returnList); + } + return returnList; + } + + public String buildWhereSQL(String db_product) throws Exception { + if (!inputData.hasFilter()) return null; + List<BasicFilter> filters = null; + try { + String filterString = inputData.getFilterString(); + Object filterobj = getFilterObject(filterString); + + filters = convertBasicFilterList(filterobj, filters); + StringBuffer sb = new StringBuffer("1=1"); + for (Object obj : filters) { + BasicFilter filter = (BasicFilter) obj; + sb.append(" AND "); + + ColumnDescriptor column = inputData.getColumn(filter.getColumn().index()); + //the column name of filter + sb.append(column.columnName()); + + //the operation of filter + FilterParser.Operation op = filter.getOperation(); + switch (op) { + case HDOP_LT: + sb.append("<"); + break; + case HDOP_GT: + sb.append(">"); + break; + case HDOP_LE: + sb.append("<="); + break; + case HDOP_GE: + sb.append(">="); + break; + case HDOP_EQ: + sb.append("="); + break; + default: + throw new UnsupportedFilterException("unsupported Filter operation : " + op); + } + // + DbProduct dbProduct = DbProduct.getDbProduct(db_product); + Object val = filter.getConstant().constant(); + switch (DataType.get(column.columnTypeCode())) { + case SMALLINT: + case INTEGER: + case BIGINT: + case FLOAT8: + case REAL: + case BOOLEAN: + sb.append(val.toString()); + break; + case TEXT: + sb.append("'").append(val.toString()).append("'"); + break; + case DATE: + //According to the database products, for the date field for special treatment. + sb.append(dbProduct.wrapDate(val)); + break; + default: + throw new UnsupportedFilterException("unsupported column type for filtering : " + column.columnTypeCode()); + } + + sb.append(""); --- End diff -- why is it needed?
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