Part 1: Key not present in map presto处理map,若key不存在,会报错,而hive会返回null。 Part 2: Cast as string 由于presto中并没有名为string的类型,出现若进行cast as string这样的转换,或者表定义中有string类型会出现Unknown type 的错误。因此我们在ASTBuilder.java中把string替换为了varchar类型(实现了对sq...
Part 1: Key not present in map presto处理map,若key不存在,会报错,而hive会返回null。 Part 2: Cast as string 由于presto中并没有名为string的类型,出现若进行cast as string这样的转换,或者表定义中有string类型会出现Unknown type 的错误。因此我们在ASTBuilder.java中把string替换为了varchar类型(实现了对sq...
Key not present in map Presto在处理MAP时,当KEY 不存在时,会报错,而Hive返回NULL,通过Presto内部参数解决: deprecated.legacy-map-subscript=true 当然整体兼容Hive并不止这些,比如函数兼容类似Java里面的多态,需要找到合适的函数;还有least/greast等函数支持,还有一些函数null处理问题,太细节了,这里就不一一介绍了。...
set hive.mapred.supports.subdirectories=true; set mapreduce.input.fileinputformat.input.dir.recursive=true; 1. 2. 3. 我们设置了参数,让默认即可递归子目录,参数为: hive.recursive-directories=true 1. Key not present in map Presto在处理MAP时,当KEY 不存在时,会报错,而Hive返回NULL,通过Presto内部参...
大家会发现一个问题HIVE在负责的查询下调用Mapreduce会很慢,在这个场景下就涌现出很多查询引擎来优化,...
8、presto获取map格式数据的值时,如果有些行的map数据的指定key值缺失,就会报错"Key not present in map",而spark和hive返回null。 示例: select m[3] from (select map(ARRAY[1,3], ARRAY[2,4]) as m 1. 9、timestamp类型列写入ORC文件时,presto默认会在stripe footer处同时写入UTC时区标志,而Spark2.3...
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Method close Method startStripe Method startRowGroup Method getRetainedSizeInBytes Method MissingFieldStreamReader Class read Method getReadPositions Method getBlock Method getBlockView Method throwAnyError Method toString Method close Method startStripe Method startRowGroup Method ...
PrestoObjectDataset.withParameters(Map<String,ParameterSpecification> parameters) Parameters: parameters withSchema public PrestoObjectDataset withSchema(Object schema) Set the schema property: Columns that define the physical type schema of the dataset. Type: array (or Expression with resultType array),...
Supplementary Table 8 shows the results of the ethnicity- and SES-stratified analyses for Biomarker Clusters 6, 8, and 9 with internalizing problems as these were key findings in the main analysis. Ethnicity- and SES-stratified analyses using linear regression showed that thiamine and TMP were ass...