2.impala支持的math和聚合计算函数

impala 用法同hive

 

 

 

Aggregate 聚合函数

• appx_median([DISTINCT|ALL] T col)
• avg([DISTINCT|ALL] col)
• count([DISTINCT|ALL] col)
• group_concat([ALL] col [, separator])
• max([DISTINCT | ALL] T col)
• min([DISTINCT | ALL] T col)
• ndv([DISTINCT | ALL] col)
• stddev([DISTINCT | ALL] col) 返回组中数字列的标准偏差
• stddev_pop([DISTINCT | ALL] col) 返回组中数字列的总体标准偏差
• stddev_samp([DISTINCT | ALL] col) 返回组中数字列的无偏样本标准差
• sum([DISTINCT | ALL] col)
• variance([DISTINCT | ALL] col) 一个聚合函数，返回一组数字的方差。这是一个数学性质，表示值与平均值之间的距离差。返回值可以为零（如果输入为单个值或一组相同的值），否则为正数
• variance_pop([DISTINCT | ALL] col) 返回组中数字列的总体标准偏差
• variance_samp([DISTINCT | ALL] col) 返回组中数字列的无偏样本标准差
• var_pop(col) 返回组中数字列的方差
• var_samp(col) 返回组中数字列的无偏样本方差

 

 

 

 

Mathematical 数学计算函数

• abs(T a)
• acos(DOUBLE a)
• asin(DOUBLE a)
• atan(DOUBLE a)
• atan2(DOUBLE a, DOUBLE b)
• bin(BIGINT a)
• ceil(T a)
• ceiling(T a)
• conv(T a, INT from_base, INT to_base)
• cos(DOUBLE a)
• cosh(DOUBLE a)
• cot(DOUBLE a)
• dceil(T a)
• degrees(DOUBLE a)
• dexp(DOUBLE a)
• dfloor(T a)
• dlog1(DOUBLE a)
• dpow(DOUBLE a, DOUBLE p)
• dround(DOUBLE a [, INT d]), round(DECIMAL val, INT d)
• dsqrt(DOUBLE a)
• dtrunc(T a, [NUMBER b])
• e()
• exp(DOUBLE a)
• factorial(T a)
• floor(T a)
• fmod(DOUBLE a, DOUBLE b), fmod(FLOAT a, FLOAT b)
• fpow(DOUBLE a, DOUBLE p)
• fnv_hash(T a)
• greatest(T a1, T a2, ...)
• hex(T a)
• is_inf(DOUBLE a)
• is_nan(DOUBLE A)
• least(T a1, T a2, ...)
• ln(DOUBLE a)
• log(DOUBLE base, DOUBLE a)
• log10(DOUBLE a)
• log2(DOUBLE a)
• max_bigint()
• max_int()
• max_smallint()
• max_tinyint()
• min_bigint()
• min_int()
• min_smallint()
• min_tinyint()
• mod(T a, T b)
• murmur_hash(T a)
• negative(T a)
• pi()
• pmod(T a, T b)
• positive(T a)
• pow(DOUBLE a, DOUBLE p)
• power(DOUBLE a, DOUBLE p)
• precision(numeric_expression)
• quotient(BIGINT numerator, BIGINT denominator), quotient(DOUBLE numerator, DOUBLE denominator)
• radians(DOUBLE a)
• rand([INT seed])
• random([INT seed])
• round(DOUBLE a [, INT d]), round(DECIMAL val, INT d)
• scale(numeric_expression)
• sign(DOUBLE a)
• sin(DOUBLE a)
• sinh(DOUBLE a)
• sqrt(DOUBLE a)
• tan(DOUBLE a)
• tanh(DOUBLE a)
• trunc(T a, [NUMBER b])
• truncate(T a, [NUMBER b])
• unhex(STRING a)
• width_bucket(DECIMAL expr, DECIMAL min_value, DECIMAL