[
https://issues.apache.org/jira/browse/HIVE-23123?focusedWorklogId=422817&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-422817
]
ASF GitHub Bot logged work on HIVE-23123:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Apr/20 16:23
Start Date: 15/Apr/20 16:23
Worklog Time Spent: 10m
Work Description: maheshk114 commented on pull request #969: HIVE-23123
Disable export/import of views and materialized views
URL: https://github.com/apache/hive/pull/969#discussion_r408619260
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/repl/ReplLoadTask.java
##########
@@ -282,6 +295,32 @@ a database ( directory )
return 0;
}
+ public static Task<?> createViewTask(MetaData metaData, String
dbNameToLoadIn, HiveConf conf)
+ throws SemanticException {
+ Table table = new Table(metaData.getTable());
+ String dbName = dbNameToLoadIn == null ? table.getDbName() :
dbNameToLoadIn;
+ TableName tableName = HiveTableName.ofNullable(table.getTableName(),
dbName);
+ String dbDotView = tableName.getNotEmptyDbTable();
+ CreateViewDesc desc = new CreateViewDesc(dbDotView, table.getAllCols(),
null, table.getParameters(),
+ table.getPartColNames(), false, false, false,
table.getSd().getInputFormat(), table.getSd().getOutputFormat(),
+ table.getSd().getSerdeInfo().getSerializationLib());
+ String originalText = table.getViewOriginalText();
+ String expandedText = table.getViewExpandedText();
+
+ if (!dbName.equals(table.getDbName())) {
+ // TODO: If the DB name doesn't match with the metadata from dump, then
need to rewrite the original and expanded
+ // texts using new DB name. Currently it refers to the source database
name.
+ }
+
+ desc.setViewOriginalText(originalText);
+ desc.setViewExpandedText(expandedText);
+ desc.setPartCols(table.getPartCols());
+ desc.setReplicationSpec(metaData.getReplicationSpec());
Review comment:
Handling for materialized view not required ?
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Issue Time Tracking
-------------------
Worklog Id: (was: 422817)
Time Spent: 20m (was: 10m)
> Disable export/import of views and materialized views
> -----------------------------------------------------
>
> Key: HIVE-23123
> URL: https://issues.apache.org/jira/browse/HIVE-23123
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Miklos Gergely
> Assignee: Miklos Gergely
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-23123.01.patch, HIVE-23123.02.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> According to
> [https://cwiki.apache.org/confluence/display/Hive/LanguageManual+ImportExport]
> import and export can be done by using the
> {code:java}
> export table ...
> import table ...
> {code}
> commands. The document doesn't mention views or materialized views at all,
> and in fact we don't support commands like
> {code:java}
> export view ...
> import view ...
> export materialized view ...
> import materialized view ...
> {code}
> they can not be parsed at all. The word table is often used though in a
> broader sense, when it means all table like entities, including views and
> materialized views. For example the various Table classes may represent any
> of these as well.
> If I try to export a view with the export table ... command, it goes fine. A
> _metadata file will be created, but no data directory, which is what we'd
> expect. If I try to import it back, an exception is thrown due to the lack of
> the data dir:
> {code:java}
> java.lang.AssertionError: null==getPath() for exim_view
> at org.apache.hadoop.hive.ql.metadata.Hive.loadTable(Hive.java:3088)
> at org.apache.hadoop.hive.ql.exec.MoveTask.execute(MoveTask.java:419)
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:213)
> at
> org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:105)
> at org.apache.hadoop.hive.ql.Executor.launchTask(Executor.java:364)
> at org.apache.hadoop.hive.ql.Executor.launchTasks(Executor.java:335)
> at org.apache.hadoop.hive.ql.Executor.runTasks(Executor.java:246)
> at org.apache.hadoop.hive.ql.Executor.execute(Executor.java:109)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:722)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:491)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:485)
> {code}
> Still the view gets imported successfully, as data movement wasn't even
> necessary.
> If we try to export a materialized view which is transactional, then this
> exception occurs:
> {code:java}
> org.apache.hadoop.hive.ql.parse.SemanticException:
> org.apache.hadoop.hive.ql.metadata.InvalidTableException: Table not found
> exim_materialized_view_da21d41a_9fe4_4446_9c72_d251496abf9d
> at
> org.apache.hadoop.hive.ql.parse.AcidExportSemanticAnalyzer.analyzeAcidExport(AcidExportSemanticAnalyzer.java:163)
> at
> org.apache.hadoop.hive.ql.parse.AcidExportSemanticAnalyzer.analyze(AcidExportSemanticAnalyzer.java:71)
> at
> org.apache.hadoop.hive.ql.parse.RewriteSemanticAnalyzer.analyzeInternal(RewriteSemanticAnalyzer.java:72)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:289)
> at org.apache.hadoop.hive.ql.Compiler.analyze(Compiler.java:220)
> at org.apache.hadoop.hive.ql.Compiler.compile(Compiler.java:104)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:183)
> at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:601)
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:547)
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:541)
> {code}
> So the export process can not handle it, as the temporary table is not
> getting created.
>
> The import command handling have a lot of codes dedicated to importing views
> and materialized views, which suggests that we support the importing (and
> thus also suggests implicitly that we support the exporting) of views and
> materialiezed views.
>
> So the conclusion is that we have to decide if we support exporting/importing
> of views and materialized views.
> If we decide not to support them then:
> - export process should throw an exception if a view or materialized view is
> the subject
> - the codes specific to view imports should be removed
> If we decide to support them, then:
> - the commands mentioned above above should be introduced
> - exception should be thrown if not the proper command used (e.g. export
> view on a table)
> - the exceptions mentioned above should be fixed
>
> I prefer not to support them, I don't think we should support the exporting /
> importing of views. The point of exporting / importing is the transfer of
> data, not DDL, it causes more issues than it solves. Our current
> documentation also suggests that it is only supported for tables.
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