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多参表达式Hive UDF

news 来源：原创 2025/6/13 7:02:14

支持的操作符

：跳过，即无条件筛选
=：等于
!=：不等于
range：区间内，range[n,m]表示 between n and m
nrange：区间外，即not between and
in：集合内，in(n,m,j,k)表示 in (‘n’,‘m’,‘j’,‘k’)
nin：集合外，即not in
regex：正则表达式，regex(^a.*)表示以a字母头

输入与输出

输入：参数个数成双。每一对参数中，参数1为任意类型的筛选列，参数2为字符串类型的条件列。
输出：true or false

select-- 等于空串multi_exp('', '=') as t1,-- 空条件key 跳过比较multi_exp('abc', '') as t2,-- 数字会自动转为string比较multi_exp(123, '=123') as t3,-- string类型multi_exp('abc', '=abc') as t4,multi_exp('abc', '!=aaa') as t5,multi_exp('23', 'range[1,100]') as t6,multi_exp('23', 'nrange[1,100]') as t7,multi_exp('abc', 'in(abc,aaa,bbb,ccc)') as t8,multi_exp('abc', 'nin(abc,aaa,bbb,ccc)') as t9,multi_exp('abc', 'regex(^a.+)') as t10,multi_exp('abc', '=abc', 'abc', '!=aaa', '23', 'range[1,100]', 'abc', 'in(abc,aaa,bbb,ccc)', 'abc', 'regex(^a.+)') t11-- map类型,multi_exp(str_to_map('k1:v1,k2:v2,k3:v3', ',', ':'), '{"k1":"=v1","k2":"=v2"}') as t12, -- k1=v1 and k2=v2, truemulti_exp(str_to_map('k1:v1,k2:v2,k3:v3', ',', ':'), '{"k1":"=v1","k2":"=v3"}') as t13  -- k1=v1 但是k2!=v3, false-- json格式字符串,multi_exp('{"k1":"v1", "k2":"v2", "k3":"v3"}', '{"k1":"=v1","k2":"=v2"}') as t14,  -- k1=v1 and k2=v2, truemulti_exp('{"k1":"v1", "k2":"v2", "k3":"v3"}', '{"k1":"=v1","k3":"=v2"}') as t15  -- k1=v1 但是k3!=v2, false
;

源码

import com.alibaba.fastjson.JSONObject;
import org.apache.hadoop.hive.ql.exec.UDF;import java.util.*;
import java.util.regex.Pattern;public class MultiExpUDF extends UDF {private static final String IGNORE = "";private static final String OPERATOR_EQ = "=";private static final String OPERATOR_NE = "!=";private static final String OPERATOR_RANGE = "range";private static final String OPERATOR_NRANGE = "nrange";private static final String OPERATOR_IN = "in";private static final String OPERATOR_NIN = "nin";private static final String OPERATOR_REGEX = "regex";public boolean evaluate(Object... args) {if (args.length % 2 != 0) {return false;}for (int i = 0; i < args.length; i += 2) {Object originalValue = args[i];Object conditionValue = args[i + 1];// 明细列处理 空值转空串originalValue = originalValue == null ? "" : originalValue;// 跳过指定条件keyif (IGNORE.equals(conditionValue)) {continue;}try {if (originalValue instanceof Map) {@SuppressWarnings("unchecked")Map<String, String> originalMap = (Map<String, String>) originalValue;String conditionStr = conditionValue.toString();if (!conditionStr.startsWith("{") || !conditionStr.endsWith("}")) {return false;}JSONObject conditionJson = JSONObject.parseObject(conditionStr);Set<String> keys = conditionJson.keySet();for (String key : keys) {String condition = conditionJson.getString(key);String original = originalMap.get(key);// 处理map中key为null或空的情况original = original == null ? "" : original;if (compares(original, condition)) {return false;}}} else {String originalStr = originalValue.toString();try {JSONObject originalJson = JSONObject.parseObject(originalStr);String conditionStr = conditionValue.toString();if (conditionStr.startsWith("{") && conditionStr.endsWith("}")) {JSONObject conditionJson = JSONObject.parseObject(conditionStr);Set<String> keys = conditionJson.keySet();for (String key : keys) {String condition = conditionJson.getString(key);String original = originalJson.getString(key);// 处理json中key为null或空的情况original = original == null ? "" : original;if (compares(original, condition)) {return false;}}} else {if (compares(originalStr, conditionStr)) {return false;}}} catch (Exception e) {if (compares(originalStr, conditionValue.toString())) {return false;}}}} catch (Exception e) {return false;}}return true;}private boolean compares(String original, String condition) {if (condition.startsWith(OPERATOR_EQ)) {String expected = condition.substring(1);if (expected.isEmpty()) {return !original.isEmpty();}return !original.equals(expected);} else if (condition.startsWith(OPERATOR_NE)) {String expected = condition.substring(2);if (expected.isEmpty()) {return original.isEmpty();}return original.equals(expected);} else if (condition.startsWith(OPERATOR_RANGE)) {String rangeStr = condition.substring(OPERATOR_RANGE.length() + 1, condition.length() - 1);String[] range = rangeStr.split(",");if (range.length == 2) {try {Comparable<?> originalVal = getComparable(original);Comparable<?> lower = getComparable(range[0]);Comparable<?> upper = getComparable(range[1]);if (originalVal.getClass().equals(lower.getClass()) && originalVal.getClass().equals(upper.getClass())) {@SuppressWarnings("unchecked")int lowerCompare = ((Comparable<Object>) originalVal).compareTo(lower);@SuppressWarnings("unchecked")int upperCompare = ((Comparable<Object>) originalVal).compareTo(upper);return lowerCompare < 0 || upperCompare > 0;}} catch (Exception e) {return true;}}return true;} else if (condition.startsWith(OPERATOR_NRANGE)) {String rangeStr = condition.substring(OPERATOR_NRANGE.length() + 1, condition.length() - 1);String[] range = rangeStr.split(",");if (range.length == 2) {try {Comparable<?> originalVal = getComparable(original);Comparable<?> lower = getComparable(range[0]);Comparable<?> upper = getComparable(range[1]);if (originalVal.getClass().equals(lower.getClass()) && originalVal.getClass().equals(upper.getClass())) {@SuppressWarnings("unchecked")int lowerCompare = ((Comparable<Object>) originalVal).compareTo(lower);@SuppressWarnings("unchecked")int upperCompare = ((Comparable<Object>) originalVal).compareTo(upper);return lowerCompare >= 0 && upperCompare <= 0;}} catch (Exception e) {return true;}}return true;} else if (condition.startsWith(OPERATOR_IN)) {String inStr = condition.substring(OPERATOR_IN.length() + 1, condition.length() - 1);List<String> values = Arrays.asList(inStr.split(","));return !values.contains(original);} else if (condition.startsWith(OPERATOR_NIN)) {String ninStr = condition.substring(OPERATOR_NIN.length() + 1, condition.length() - 1);List<String> values = Arrays.asList(ninStr.split(","));return values.contains(original);} else if (condition.startsWith(OPERATOR_REGEX)) {String patternStr = condition.substring(OPERATOR_REGEX.length() + 1, condition.length() - 1);Pattern pattern = Pattern.compile(patternStr);return !pattern.matcher(original).find();}return true;}private Comparable<?> getComparable(String value) {try {return Integer.parseInt(value);} catch (NumberFormatException e) {try {return Double.parseDouble(value);} catch (NumberFormatException ex) {return value;}}}
//public static void main(String[] args) {MultiExpUDF udf = new MultiExpUDF();// 测试 普通字符串boolean result1 = udf.evaluate( "1", null);System.out.println("非 map 或 json 字符串测试结果: " + result1);}
//        // 测试 含正则
//        boolean result2 = udf.evaluate("abc", "=abc", "aabcdef", "regex(cd.*)");
//        System.out.println("含正则输入测试结果: " + result2);
//
//        // 测试 map 类型
//        Map<String, String> map = new HashMap<>();
//        map.put("key1", "abc");
//        map.put("key2", "efg");
//        map.put("key3", "ab");
//        boolean result3 = udf.evaluate(map, "{\"key1\":\"=abc\",\"key2\":\"!=bcd\",\"key3\":\"in(ab,b)\"}");
//        System.out.println("map 类型测试结果: " + result3);
//
//        // 测试 json 格式字符串测试
//        String jsonStr = "{\"key1\":\"abc\",\"key2\":\"efg\",\"key3\":\"5\"}";
//        boolean result4 = udf.evaluate(jsonStr, "{\"key1\":\"=abc\",\"key2\":\"!=bcd\",\"key3\":\"range[5,10]\"}");
//        System.out.println("json 格式字符串测试结果: " + result4);
//
//        // 测试 map 中 key 为空的情况
//        Map<String, String> map2 = new HashMap<>();
//        map2.put("key1", "abc");
//        map2.put("key2", null);
//        boolean result6 = udf.evaluate(map2, "{\"key1\":\"=abc\",\"key2\":\"=\"}");
//        System.out.println("测试 map 中 key 为空的情况: " + result6);
//
//        // 测试 json 中 key 为空的情况
//        String jsonStr2 = "{\"key1\":\"abc\",\"key2\":null}";
//        boolean result7 = udf.evaluate(jsonStr2, "{\"key1\":\"=abc\",\"key3\":\"=\"}");
//        System.out.println("测试 json 中 key 为空的情况: " + result7);
//
//        // 测试 not in 功能
//        boolean result8 = udf.evaluate("abc1", "nin(abc,def,ghi)");
//        System.out.println("测试 not in 功能结果: " + result8);
//
//        // 测试 not between 功能
//        boolean result9 = udf.evaluate("3", "nrange[4,6]");
//        System.out.println("测试 not between 功能结果: " + result9);
//    }
}