I do not believe such casts are implemented. This can be helpful for people analyzing data where the precision of decimal128 is not needed

Reporter: Wes McKinney / @wesm
Assignee: Antoine Pitrou / @pitrou

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)
• [C++] Implement casts from float/double to decimal128 (is related to)
• [Python] support conversion to decimal type from floats? (is related to)

PRs and other links:

• GitHub Pull Request #7618

_{Note: This issue was originally created as ARROW-7010. Please see the migration documentation for further details.}