json Many-to-one mapping #220
Open
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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
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Outdated suggestions cannot be applied.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.
I encountered the problem of merging different JSON data sources，I solved the problem of mapping different data source fields in the following way：
different field names of source json data are mapped to the same field of the Hive table
configure：
`create external table TEST(
col1 string,
col2 string,
col3 string
)
partitioned by (dt int)
ROW FORMAT SERDE 'org.openx.data.jsonserde.JsonSerDe'
with serdeproperties(
"mapping.col1" = "key1|key2|key3"
)
`
Although key1,key2 and key3 come from different data sources, it represents the same data meaning. By configuring,they will be mapped to col1