我想取得成功 select shiftleft(1,3) ; 使用 select 1 << 3 ; 我复制和修改 org.apache.hadoop.hive.ql.udf.UDFOPBitAnd 至 org.apache.hadoop.hive.ql.udf.UDFOPBitShiftLeftOpt ，那么我只需要换衣服 & 至 << ，然后我修改 org.apache.hadoop.hive.ql.exec.FunctionRegistry ，添加 system.registerUDF("<<", UDFOPBitShiftLeftOpt.class, true); 到静态代码：
然后我打包源代码，重新启动配置单元，运行 select 1 << 3 ，获取错误

hive> select 1 << 3;
NoViableAltException(331@[412:1: atomExpression : ( constant | ( intervalExpression )=> intervalExpression | castExpression | extractExpression | floorExpression | caseExpression | whenExpression | ( subQueryExpression )=> ( subQueryExpression ) -> ^( TOK_SUBQUERY_EXPR TOK_SUBQUERY_OP subQueryExpression ) | ( functionName LPAREN )=> function | tableOrColumn | expressionsInParenthesis[true] );])
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser$DFA36.specialStateTransition(HiveParser_IdentifiersParser.java:31810)
    at org.antlr.runtime.DFA.predict(DFA.java:80)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.atomExpression(HiveParser_IdentifiersParser.java:6746)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceFieldExpression(HiveParser_IdentifiersParser.java:6988)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceUnaryPrefixExpression(HiveParser_IdentifiersParser.java:7324)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceUnarySuffixExpression(HiveParser_IdentifiersParser.java:7380)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceBitwiseXorExpression(HiveParser_IdentifiersParser.java:7542)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceStarExpression(HiveParser_IdentifiersParser.java:7685)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedencePlusExpression(HiveParser_IdentifiersParser.java:7828)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceConcatenateExpression(HiveParser_IdentifiersParser.java:7967)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceAmpersandExpression(HiveParser_IdentifiersParser.java:8177)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceBitwiseOrExpression(HiveParser_IdentifiersParser.java:8314)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceSimilarExpressionPart(HiveParser_IdentifiersParser.java:8943)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceSimilarExpressionMain(HiveParser_IdentifiersParser.java:8816)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceSimilarExpression(HiveParser_IdentifiersParser.java:8697)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceEqualExpression(HiveParser_IdentifiersParser.java:9537)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceNotExpression(HiveParser_IdentifiersParser.java:9703)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceAndExpression(HiveParser_IdentifiersParser.java:9812)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceOrExpression(HiveParser_IdentifiersParser.java:9953)
    at org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.expression(HiveParser_IdentifiersParser.java:6686)
    at org.apache.hadoop.hive.ql.parse.HiveParser.expression(HiveParser.java:41896)
    at org.apache.hadoop.hive.ql.parse.HiveParser_SelectClauseParser.selectItem(HiveParser_SelectClauseParser.java:1662)
    at org.apache.hadoop.hive.ql.parse.HiveParser_SelectClauseParser.selectList(HiveParser_SelectClauseParser.java:1155)
    at org.apache.hadoop.hive.ql.parse.HiveParser_SelectClauseParser.selectClause(HiveParser_SelectClauseParser.java:950)
    at org.apache.hadoop.hive.ql.parse.HiveParser.selectClause(HiveParser.java:42010)
    at org.apache.hadoop.hive.ql.parse.HiveParser.atomSelectStatement(HiveParser.java:36720)
    at org.apache.hadoop.hive.ql.parse.HiveParser.selectStatement(HiveParser.java:36987)
    at org.apache.hadoop.hive.ql.parse.HiveParser.regularBody(HiveParser.java:36633)
    at org.apache.hadoop.hive.ql.parse.HiveParser.queryStatementExpressionBody(HiveParser.java:35822)
    at org.apache.hadoop.hive.ql.parse.HiveParser.queryStatementExpression(HiveParser.java:35710)
    at org.apache.hadoop.hive.ql.parse.HiveParser.execStatement(HiveParser.java:2284)
    at org.apache.hadoop.hive.ql.parse.HiveParser.statement(HiveParser.java:1333)
    at org.apache.hadoop.hive.ql.parse.ParseDriver.parse(ParseDriver.java:208)
    at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:77)
    at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:70)
    at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:468)
    at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1317)
    at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1457)
    at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1237)
    at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1227)
    at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:233)
    at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:184)
    at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
    at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:821)
    at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:759)
    at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:686)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.util.RunJar.run(RunJar.java:244)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:158)
FAILED: ParseException line 1:10 cannot recognize input near '<' '3' '<EOF>' in expression specification
hive>

我想知道我是否错过了什么。。