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filter:过滤数据,只有符合特定条件的数据才会被保留下来,然后进入下一个数据流。
filter data by $0 == 1 filter data by $0 != 1
filter data by $0 matches ‘CM.*‘;
字符串包含CM
filter data by $0 matches ‘.*CM.*‘;
filter data by not $0==1; filter data by not $0 matches ‘.*CM.*‘;
filter data by $0 is not null;
filter data by isValidate($0);
filter data by $0!=1 and $1>10
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原文地址:http://www.cnblogs.com/lishouguang/p/4559300.html