Incorrect Calculation of Natural Logarithm (ln) Function

[BlancoMY]

Environment:

• eKuiper version: 1.11.4
• Hardware configuration:
• OS : Alpine docker image running on Ubuntu 22.04 host
• Others:

What happened and what you expected to happen: The current implementation of the math function in the eKuiper framework is incorrectly calculating the natural logarithm (ln) as log2 (ln(x)/ln(2)). This has led to incorrect results in scenarios where the ln(x) function is expected.

How to reproduce it (as minimally and precisely as possible):

• Use the math function to calculate the natural logarithm (ln) of a given input.
• Compare the result with the expected value for ln(x).