Docs for skew and kurt #1127
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Docs for skew and kurt #1127
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`skew`,`skew_pop` and `skewness` is used to calculate [skewness](https://en.wikipedia.org/wiki/Skewness#Pearson.27s_moment_coefficient_of_skewness) of a data distribution. `kurt`,`kurt_pop` and `kurtosis` is used to calculate [kurtosis](https://en.wikipedia.org/wiki/Kurtosis) of a data distribution. The implementation references ClickHouse/ClickHouse#5200, and modified result type to AlwaysNullable since doris do not support NaN. The formula used to calculate skew is `3-th moments / (variance^{1.5})` The formula used to calculate kurt is `4-th moments / (variance^{2}) - 3` when value of any result is NaN, doris will return NULL. doc: apache/doris-website#1127
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`skew`,`skew_pop` and `skewness` is used to calculate [skewness](https://en.wikipedia.org/wiki/Skewness#Pearson.27s_moment_coefficient_of_skewness) of a data distribution. `kurt`,`kurt_pop` and `kurtosis` is used to calculate [kurtosis](https://en.wikipedia.org/wiki/Kurtosis) of a data distribution. The implementation references ClickHouse/ClickHouse#5200, and modified result type to AlwaysNullable since doris do not support NaN. The formula used to calculate skew is `3-th moments / (variance^{1.5})` The formula used to calculate kurt is `4-th moments / (variance^{2}) - 3` when value of any result is NaN, doris will return NULL. doc: apache/doris-website#1127
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`skew`,`skew_pop` and `skewness` is used to calculate [skewness](https://en.wikipedia.org/wiki/Skewness#Pearson.27s_moment_coefficient_of_skewness) of a data distribution. `kurt`,`kurt_pop` and `kurtosis` is used to calculate [kurtosis](https://en.wikipedia.org/wiki/Kurtosis) of a data distribution. The implementation references ClickHouse/ClickHouse#5200, and modified result type to AlwaysNullable since doris do not support NaN. The formula used to calculate skew is `3-th moments / (variance^{1.5})` The formula used to calculate kurt is `4-th moments / (variance^{2}) - 3` when value of any result is NaN, doris will return NULL. doc: apache/doris-website#1127
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`skew`,`skew_pop` and `skewness` is used to calculate [skewness](https://en.wikipedia.org/wiki/Skewness#Pearson.27s_moment_coefficient_of_skewness) of a data distribution. `kurt`,`kurt_pop` and `kurtosis` is used to calculate [kurtosis](https://en.wikipedia.org/wiki/Kurtosis) of a data distribution. The implementation references ClickHouse/ClickHouse#5200, and modified result type to AlwaysNullable since doris do not support NaN. The formula used to calculate skew is `3-th moments / (variance^{1.5})` The formula used to calculate kurt is `4-th moments / (variance^{2}) - 3` when value of any result is NaN, doris will return NULL. doc: apache/doris-website#1127
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`skew`,`skew_pop` and `skewness` is used to calculate [skewness](https://en.wikipedia.org/wiki/Skewness#Pearson.27s_moment_coefficient_of_skewness) of a data distribution. `kurt`,`kurt_pop` and `kurtosis` is used to calculate [kurtosis](https://en.wikipedia.org/wiki/Kurtosis) of a data distribution. The implementation references ClickHouse/ClickHouse#5200, and modified result type to AlwaysNullable since doris do not support NaN. The formula used to calculate skew is `3-th moments / (variance^{1.5})` The formula used to calculate kurt is `4-th moments / (variance^{2}) - 3` when value of any result is NaN, doris will return NULL. doc: apache/doris-website#1127
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ref apache/doris#40945