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2018-10-11 Thread HyukjinKwon
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2018-10-10 Thread HyukjinKwon
Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/22688 I have no idea why it passes in my local. I fixed the test. --- - To unsubscribe, e-mail:

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2018-10-10 Thread HyukjinKwon
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2018-10-10 Thread HyukjinKwon
Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/22688 +1 to deal with this as non blocker. I understand data source v2 is under heavy development and unstable but strongly think we should backport .. it breaks a basic operation .. ---

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2018-10-10 Thread cloud-fan
Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/22688 ah good point. I think the original design of append operator assumes the table already exists, so a schema should be provided. If we treat file path as a table, then append should fail for your

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2018-10-10 Thread HyukjinKwon
Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/22688 Another concern is, it doesn't sound to me straightforward that readsupport is created and executed in write path. So, at least, we should just read the schema when it's needed (when

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2018-10-10 Thread HyukjinKwon
Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/22688 Other datasources such as Parquet, ORC and JDBC won't be adoptable to the current design since we can't read the schema from the information given the code I provided above. ---

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2018-10-10 Thread HyukjinKwon
Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/22688 The point is not write only datasource, @cloud-fan. For instance, `spark.read.range(1).format("source").write("non-existent-path")`. There's no way to read the schema. There's no complaints so

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2018-10-10 Thread cloud-fan
Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/22688 Do we have users complain about it? In the new write API design, a data source must provide a schema. I don't think it's practical that people need a write-only data source which can

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2018-10-10 Thread HyukjinKwon
Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/22688 cc @cloud-fan and @rdblue, this is more conservative but I would prefer to revert it at https://github.com/apache/spark/pull/22686 rather then exposing append mode in 2.4. I don't think it's a

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