datafusion

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Add interface to determine whether expr is a constant

3

for datafusion, we need to add interface which is used to identify the expr is constant or literal or not. If we have this interface, we can make more optimization....

liukun4515

[Question] interested in helping with documentation

1

Hi all, I want to help with the documentation and I can pull issues from here to work on, but I have questions about how docs should be organized for...

kmitchener

**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** As a user of DataFusion, how do I know what functions are...

andygrove

[Question] Optimize multiple reads on same DataFrame

1

Hey, I have a scenario where I have to run the same filter expression but with different values on the same RecordBatch For example ``` let c2: Vec = .......

ParadoxShmaradox

**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** Following on from #2529, it would be good to support external tables...

mirober

Version 0.6.0 Panic error during SQL execution

3

**Describe the bug** Panic error occurs when executing Join SQL. Refer to the attached jupyter execution result. Exception: Arrow error: External error: Arrow error: External error: Execution error: Join Error:...

ike560

Updating arrow2 branch

21

The arrow2 branch is currently using `v0.10.0` - I'd like to update it to work with v0.12.0. Is there anything I should know before starting this? I ask as last...

dbr

coercion rule about `eq` and InList between string type and numeric type

8

I have some concerns about the rule between string and number. I check some situation in the spark: ``` spark-sql> desc t3; c1 int spark-sql> explain extended select * from...

liukun4515

division decimal: lose precision when convert i128 to f64

1

But now I find a bug in the arithmetic operation. https://github.com/apache/arrow-datafusion/blob/c91efc27658e58264c4f346a5cfdec8810179e90/datafusion/physical-expr/src/expressions/binary.rs#L302 and https://github.com/apache/arrow-datafusion/blob/c91efc27658e58264c4f346a5cfdec8810179e90/datafusion/physical-expr/src/expressions/binary.rs#L307 In the divide method, we may lose of precision by converting the `i128` to `f64`. We use...

liukun4515

Thank you @liukun4515 -- I reviewed the tests carefully and I think this looks good. The code "feels" a little more complicated than needed but I think it is doing...

liukun4515