[SPARK-47681][FOLLOWUP] Fix schema_of_variant for float inputs. #47058
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Contributor
Author
|
@cloud-fan could you help review? Thanks! |
cloud-fan
reviewed
Jun 21, 2024
|
|
||
| // This branch is only used by `SchemaOfVariant.mergeSchema` because `JsonInferSchema` never | ||
| // produces `FloatType`. | ||
| case (FloatType, _: DecimalType) | (_: DecimalType, FloatType) => |
Contributor
There was a problem hiding this comment.
Is there a standard for this? These two are not compatible, because float is approximate but decimal is not.
Anyway, I'm fine with this as we already did it for double type.
Contributor
Author
There was a problem hiding this comment.
I'm not aware of an existing standard, but I think we can follow the type resolution rules in the add operator:
Based on this result, I think it may be better to change the result of float x decimal into double.
Changing decimal into float/double may indeed lose precision, but I think it is a reasonable approach in the shcema inference.
cloud-fan
approved these changes
Jun 21, 2024
Contributor
Author
|
@cloud-fan could you help merge it? Thanks! |
cloud-fan
approved these changes
Jun 24, 2024
Contributor
|
thanks, merging to master! |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
What changes were proposed in this pull request?
The current
schema_of_variantdepends onJsonInferSchema.compatibleTypeto find the common type of two types. This function doesn't handle the case offloat x decimalordecimal x floatcorrectly. It doesn't produce the expected result, but consider the two types as incompatible and producesvariant. This change doesn't affect the JSON schema inference because it never producesfloatbeforehand.Why are the changes needed?
It is a bug fix and is required to process floats correctly.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
A new unit test that checks all type combinations.
Was this patch authored or co-authored using generative AI tooling?
No.