hive -e执行出现「cannot recognize input near '<EOF>' in select clause」问题

问题现象

写了一个简单的shell脚本调用hive执行组装的sql，在执行时总是报cannot recognize input near '<EOF>' in select clause错误，
单独在hive提示符下却能正常执行。

#!/bin/bash
keyname="type"
sql=" 
select tags['$keyname'] from user_tags
"

echo ${sql}

hive -e ${sql}

执行时打印的错误日志：

select tags['$keyname'] from user_tags

Logging initialized using configuration in jar:file:/opt/apache-hive-1.2.1-bin/lib/hive-common-1.2.1.jar!/hive-log4j.properties
NoViableAltException(-1@[])
	at org.apache.hadoop.hive.ql.parse.HiveParser_SelectClauseParser.selectClause(HiveParser_SelectClauseParser.java:1087)
	at org.apache.hadoop.hive.ql.parse.HiveParser.selectClause(HiveParser.java:45827)
	at org.apache.hadoop.hive.ql.parse.HiveParser.selectStatement(HiveParser.java:41495)
	at org.apache.hadoop.hive.ql.parse.HiveParser.regularBody(HiveParser.java:41402)
	at org.apache.hadoop.hive.ql.parse.HiveParser.queryStatementExpressionBody(HiveParser.java:40413)
	at org.apache.hadoop.hive.ql.parse.HiveParser.queryStatementExpression(HiveParser.java:40283)
	at org.apache.hadoop.hive.ql.parse.HiveParser.execStatement(HiveParser.java:1590)
	at org.apache.hadoop.hive.ql.parse.HiveParser.statement(HiveParser.java:1109)
	at org.apache.hadoop.hive.ql.parse.ParseDriver.parse(ParseDriver.java:202)
	at org.apache.hadoop.hive.ql.parse.ParseDriver.parse(ParseDriver.java:166)
	at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:396)
	at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:308)
	at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1122)
	at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1170)
	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1059)
	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1049)
	at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:213)
	at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:165)
	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:376)
	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:311)
	at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:708)
	at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:681)
	at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:621)
	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:221)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
FAILED: ParseException line 1:6 cannot recognize input near '<EOF>' '<EOF>' '<EOF>' in select clause

解决方案

修改hive -e ${sql}为hive -e "${sql}"

原因分析

若没有使用双引号进行包括，则"hive -e"会认为后面的sql内容解析为多个参数造成错误。而使用双引号后，整个sql将作为一个单独的参数传给hive。