Question

我无法像主键一样创建带有约束的表，或者不能为null。没有限制，我可以成功创建表。

我发现Hive在2.1.0中作为create table命令的一部分支持主键/外键约束，而我的版本是2.3.0。以下是示例代码：

create table test3(a int primary key)

，这将向我返回以下错误消息：

MismatchedTokenException(221!=347)
    at org.antlr.runtime.BaseRecognizer.recoverFromMismatchedToken(BaseRecognizer.java:617)
    at org.antlr.runtime.BaseRecognizer.match(BaseRecognizer.java:115)
    at org.apache.hadoop.hive.ql.parse.HiveParser.createTableStatement(HiveParser.java:6179)
    at org.apache.hadoop.hive.ql.parse.HiveParser.ddlStatement(HiveParser.java:3808)
    at org.apache.hadoop.hive.ql.parse.HiveParser.execStatement(HiveParser.java:2382)
    at org.apache.hadoop.hive.ql.parse.HiveParser.statement(HiveParser.java:1333)
    at org.apache.hadoop.hive.ql.parse.ParseDriver.parse(ParseDriver.java:204)
    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:1316)
    at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1456)
    at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1236)
    at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1226)
    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:221)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
FAILED: ParseException line 1:25 mismatched input 'primary' expecting ) near 'int' in create table statement

我正在使用Hive 2.3.0和Hadoop 2.7.3。

Answer 1

您将必须使用以下命令创建PRIMARY KEY

CREATE TABLE TEST3(A INT
  PRIMARY KEY(A) disable novalidate);

由于未验证这些约束，因此上游系统需要确保将数据加载到Hive中之前的完整性。

无法在Hive 2.3.0中创建具有约束的hive表

1 个答案: