1. ABS:
- 描述: 计算绝对值。
- 示例:
A = LOAD 'data.txt' AS (value:double);
B = FOREACH A GENERATE ABS(value) AS absolute_value;
2. ROUND:
- 描述: 四舍五入到指定的小数位数。
- 示例:
A = LOAD 'data.txt' AS (price:double);
B = FOREACH A GENERATE ROUND(price, 2) AS rounded_price;
3. CEIL 和 FLOOR:
- CEIL描述: 将数字向上舍入到最接近的整数。
- FLOOR描述: 将数字向下舍入到最接近的整数。
- 示例:
A = LOAD 'data.txt' AS (amount:double);
B = FOREACH A GENERATE CEIL(amount) AS ceil_amount, FLOOR(amount) AS floor_amount;
4. LOG:
- 描述: 计算对数。
- 示例:
A = LOAD 'data.txt' AS (num:double);
B = FOREACH A GENERATE LOG(10, num) AS log_base_10;
5. POWER:
- 描述: 计算指定数字的幂。
- 示例:
A = LOAD 'data.txt' AS (base:double, exponent:double);
B = FOREACH A GENERATE POWER(base, exponent) AS result;
6. SQRT:
- 描述: 计算平方根。
- 示例:
A = LOAD 'data.txt' AS (number:double);
B = FOREACH A GENERATE SQRT(number) AS square_root;
这些是一些在Apache Pig中常见的数学函数。这些函数可用于对数据执行各种数学操作,例如绝对值计算、舍入、对数运算等。
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