[SPARK-31102][SQL] Spark-sql fails to parse when contains comment. by javierivanov · Pull Request #27920 · apache/spark

javierivanov · 2020-03-16T02:11:43Z

What changes were proposed in this pull request?

This PR introduces a change to false for the insideComment flag on a newline. Fixing the issue introduced by SPARK-30049.

Why are the changes needed?

Previously on SPARK-30049 a comment containing an unclosed quote produced the following issue:

spark-sql> SELECT 1 -- someone's comment here
> ;
Error in query: extraneous input ';' expecting <EOF>(line 2, pos 0)
== SQL ==
SELECT 1 -- someone's comment here
;
^^^

This was caused because there was no flag for comment sections inside the splitSemiColon method to ignore quotes. SPARK-30049 added that flag and fixed the issue, but introduced the follwoing problem:

spark-sql> select
> 1,
> -- two
> 2;
Error in query:
mismatched input '<EOF>' expecting {'(', 'ADD', 'AFTER', 'ALL', 'ALTER', ...}(line 3, pos 2)
== SQL ==
select
1,
--^^^

This issue is generated by a missing turn-off for the insideComment flag with a newline.

Does this PR introduce any user-facing change?

No

How was this patch tested?

For previous tests using line-continuity(\) it was added a line-continuity rule in the SqlBase.g4 file to add the functionality to the SQL context.
A new test for inline comments was added.

maropu · 2020-03-16T02:42:29Z

ok to test

SparkQA · 2020-03-16T03:19:42Z

Test build #119825 has finished for PR 27920 at commit d69d271.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

maropu · 2020-03-16T04:55:20Z

- """SELECT concat('test', 'comment') -- someone's comment here \\
- | comment continues here with single ' quote \\
- | extra ' \\
- | ;""".stripMargin -> "testcomment"


Why you did you remove the existing tests instead of adding new tests?

Hey @maropu !
The SQL parser does not recognize line-continuity per se.
scala> sql(s"""SELECT concat('test', 'comment') -- someone's comment here \\\ncomment continues here with single ' quote \\\nextra ' \\""") org.apache.spark.sql.catalyst.parser.ParseException: mismatched input 'continues' expecting {<EOF>, ',', 'CLUSTER', 'DISTRIBUTE', 'EXCEPT', 'FROM', 'GROUP', 'HAVING', 'INTERSECT', 'LATERAL', 'LIMIT', 'ORDER', 'MINUS', 'SORT', 'UNION', 'WHERE', 'WINDOW', '-'}(line 2, pos 8) == SQL == SELECT concat('test', 'comment') -- someone's comment here \ comment continues here with single ' quote \ --------^^^ extra ' \
It works just fine for inline comments included backslash:
scala> sql(s"""SELECT concat('test', 'comment') -- someone's comment here \\\n,2""") show +---------------------+---+ |concat(test, comment)| 2| +---------------------+---+ | testcomment| 2| +---------------------+---+
But does not work outside the inline comment(the backslash):
sql(s"""SELECT concat('test', 'comment') -- someone's comment here \n,2\\\n""") org.apache.spark.sql.catalyst.parser.ParseException: extraneous input '\' expecting <EOF>(line 2, pos 2) == SQL == SELECT concat('test', 'comment') -- someone's comment here ,2\ --^^^
Previously worked fine because of this very bug, the insideComment flag ignored everything until the end of the string. But the spark SQL parser does not recognize the backslashes. Line-continuity can be added to the CLI. But I think that feature should be added directly to the SQL parser to avoid confusion.
Let me know your thoughts 👍

If we can, the fix in SqlBase.g4 (SIMPLE_COMENT) looks fine to me and I think the queries above should work in Spark SQL: https://github.com/apache/spark/blob/master/sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4#L1811 Could you try?

@maropu I have added the fix. Let me know what you think :)

maropu · 2020-03-16T04:56:18Z

cc: @wangyum

maropu · 2020-04-09T08:16:57Z

@javierivanov Any update?

javierivanov · 2020-04-09T14:26:04Z

@maropu I am extremly sorry, I will commit soon :)

SparkQA · 2020-04-13T07:05:01Z

Test build #121162 has finished for PR 27920 at commit 440dcbd.

This patch fails due to an unknown error code, -9.
This patch merges cleanly.
This patch adds no public classes.

maropu · 2020-04-13T07:11:39Z

retest this please

SparkQA · 2020-04-13T13:49:52Z

Test build #121181 has finished for PR 27920 at commit 440dcbd.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2020-04-13T15:18:31Z

Test build #121211 has finished for PR 27920 at commit 0571f21.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

maropu · 2020-04-14T01:39:08Z

retest this please

maropu · 2020-04-14T01:45:16Z

Could you check this? @wangyum

SparkQA · 2020-04-14T07:05:02Z

Test build #121243 has finished for PR 27920 at commit 0571f21.

This patch fails due to an unknown error code, -9.
This patch merges cleanly.
This patch adds no public classes.

maropu · 2020-04-14T07:12:20Z

retest this please

SparkQA · 2020-04-14T12:10:39Z

Test build #121260 has finished for PR 27920 at commit 0571f21.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

javierivanov · 2020-05-06T14:58:33Z

ping @wangyum @maropu :)

maropu · 2020-05-06T23:50:21Z


 SIMPLE_COMMENT
- : '--' ~[\r\n]* '\r'? '\n'? -> channel(HIDDEN)
+ : '--' ('\\\n' | ~[\r\n])* '\r'? '\n'? -> channel(HIDDEN)


Ur, one more comment; could you add tests in sql-tests/inputs/comments.sql, too?

maropu · 2020-05-06T23:58:19Z

retest this please

maropu · 2020-05-06T23:58:30Z

cc: @cloud-fan

cloud-fan · 2020-05-07T04:32:22Z

+
+ test("SPARK-30049 Should not complain for quotes in commented with multi-lines") {
 runCliWithin(1.minute)(
- """SELECT concat('test', 'comment') -- someone's comment here \\


so double-slash doesn't work any more?

It was a previous mistake since using Scala multi-line strings it auto escape chars.

cloud-fan · 2020-05-07T04:33:55Z


+ test("single comment case two") {
+ val plan = table("a").select(star())
+ assertEqual("-- single comment\\\nwith line continuity\nSELECT * FROM a", plan)


how to interpret \\\n? An escaped slash and a new-line symbol?

Thats correct. Inline strings need to be escaped.

SparkQA · 2020-05-07T05:04:41Z

Test build #122383 has finished for PR 27920 at commit 0571f21.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

cloud-fan · 2020-05-12T13:46:17Z

thanks, merging to master!

cloud-fan · 2020-05-12T13:49:31Z

it conflicts with 3.0, @javierivanov can you open a new PR for 3.0? Thanks!

maropu · 2020-05-17T23:22:16Z

@javierivanov kindly ping: #27920 (comment)

This PR introduces a change to false for the insideComment flag on a newline. Fixing the issue introduced by SPARK-30049. Previously on SPARK-30049 a comment containing an unclosed quote produced the following issue: ``` spark-sql> SELECT 1 -- someone's comment here > ; Error in query: extraneous input ';' expecting <EOF>(line 2, pos 0) == SQL == SELECT 1 -- someone's comment here ; ^^^ ``` This was caused because there was no flag for comment sections inside the splitSemiColon method to ignore quotes. SPARK-30049 added that flag and fixed the issue, but introduced the follwoing problem: ``` spark-sql> select > 1, > -- two > 2; Error in query: mismatched input '<EOF>' expecting {'(', 'ADD', 'AFTER', 'ALL', 'ALTER', ...}(line 3, pos 2) == SQL == select 1, --^^^ ``` This issue is generated by a missing turn-off for the insideComment flag with a newline. No - For previous tests using line-continuity(`\`) it was added a line-continuity rule in the SqlBase.g4 file to add the functionality to the SQL context. - A new test for inline comments was added. Closesapache#27920 from javierivanov/SPARK-31102. Authored-by: Javier Fuentes <j.fuentes.m@icloud.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com>

This PR introduces a change to false for the insideComment flag on a newline. Fixing the issue introduced by SPARK-30049. Backport to 3.0 from #27920 Previously on SPARK-30049 a comment containing an unclosed quote produced the following issue: ``` spark-sql> SELECT 1 -- someone's comment here > ; Error in query: extraneous input ';' expecting <EOF>(line 2, pos 0) == SQL == SELECT 1 -- someone's comment here ; ^^^ ``` This was caused because there was no flag for comment sections inside the splitSemiColon method to ignore quotes. SPARK-30049 added that flag and fixed the issue, but introduced the follwoing problem: ``` spark-sql> select > 1, > -- two > 2; Error in query: mismatched input '<EOF>' expecting {'(', 'ADD', 'AFTER', 'ALL', 'ALTER', ...}(line 3, pos 2) == SQL == select 1, --^^^ ``` This issue is generated by a missing turn-off for the insideComment flag with a newline. No - For previous tests using line-continuity(`\`) it was added a line-continuity rule in the SqlBase.g4 file to add the functionality to the SQL context. - A new test for inline comments was added. Closes#27920 from javierivanov/SPARK-31102. Authored-by: Javier Fuentes <j.fuentes.micloud.com> Signed-off-by: Wenchen Fan <wenchendatabricks.com> ### What changes were proposed in this pull request? ### Why are the changes needed? ### Does this PR introduce _any_ user-facing change? ### How was this patch tested? Closes#28565 from javierivanov/SPARK-3.0-31102. Authored-by: Javier Fuentes <j.fuentes.m@icloud.com> Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>

javierivanov added 2 commits March 15, 2020 22:19

fixes for SPARK-31102
5c0a000

fixed tests
d69d271

maropu reviewed Mar 16, 2020
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javierivanov added 2 commits April 12, 2020 13:46

Merge branch 'master' into SPARK-31102
9d354c2

added multi-line to single comments
440dcbd

probot-autolabelerBot added the SQL label Apr 13, 2020

maropu reviewed Apr 13, 2020
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Comment threadsql/hive-thriftserver/src/test/scala/org/apache/spark/sql/hive/thriftserver/CliSuite.scala Outdated

maropu reviewed Apr 13, 2020
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Comment threadsql/hive-thriftserver/src/test/scala/org/apache/spark/sql/hive/thriftserver/CliSuite.scala Outdated

maropu reviewed Apr 13, 2020
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Comment threadsql/hive-thriftserver/src/test/scala/org/apache/spark/sql/hive/thriftserver/CliSuite.scala Outdated

maropu reviewed Apr 13, 2020
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Comment threadsql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4

fixes
0571f21

maropu reviewed May 6, 2020
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cloud-fan reviewed May 7, 2020
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cloud-fan closed this in 178ca96May 12, 2020

javierivanov mentioned this pull request May 18, 2020
[SPARK-31102][SQL][3.0] Spark-sql fails to parse when contains comment #28565
Closed

This was referenced Jan 5, 2021
[SPARK-33100][SQL][3.0] Ignore a semicolon inside a bracketed comment in spark-sql #31033
Closed
[SPARK-33100][SQL][2.4] Ignore a semicolon inside a bracketed comment in spark-sql #31040
Closed

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