[jira] [Created] (HIVE-4742) A useless CAST makes Hive fail to create a VIEW based on an UNION

["Nicolas Lalevée (JIRA)" <ji...@apache.org>]

Nicolas Lalevée created HIVE-4742:
-------------------------------------

             Summary: A useless CAST makes Hive fail to create a VIEW based on an UNION
                 Key: HIVE-4742
                 URL: https://issues.apache.org/jira/browse/HIVE-4742
             Project: Hive
          Issue Type: Bug
    Affects Versions: 0.11.0
            Reporter: Nicolas Lalevée


I create programmatically a script to create a view which is a union of all kind of event I have. To keep things simple, data are just blindly cast as STRING. It used to work with Hive 0.10, not anymore with 0.11.

I tried to narrow down the simplest script. It seems that it only occurs if a least a view and an union is involved.

Here is a failing script:
{noformat}
CREATE TABLE Event1 (d STRING, userid BIGINT, eventData1 STRING);
CREATE TABLE Event2 (d STRING, userid BIGINT, eventData2 STRING);
CREATE VIEW AllEventsTest
  AS SELECT * FROM (
    SELECT 'Event1' AS eventType, map('d', CAST(`d` AS STRING)) AS eventData FROM Event1
    UNION ALL
    SELECT 'Event2' AS eventType, map('d', CAST(`d` AS STRING)) AS eventData FROM Event2
) d;
{noformat}

There are warnings in the logs:
{noformat}
o.a.h.h.q.parse.TypeCheckProcFactory - Invalid type entry TOK_STRING=null
o.a.h.h.q.parse.TypeCheckProcFactory - Invalid type entry TOK_STRING=null
{noformat}

And the error is:
{noformat}
FAILED: IllegalArgumentException replace op boundaries of <ReplaceOp@[@46,103:105='`d`',<26>,3:52]..[@46,103:105='`d`',<26>,3:52]:"`event1`.`d`"> overlap with previous <ReplaceOp@[@44,98:101='CAST',<48>,3:47]..[@51,116:116=')',<276>,3:65]:"`event1`.`d`">
10:52:51.024 [scoopMapredScheduler_Worker-9 ] [ERROR] org.apache.hadoop.hive.ql.Driver - FAILED: IllegalArgumentException replace op boundaries of <ReplaceOp@[@46,103:105='`d`',<26>,3:52]..[@46,103:105='`d`',<26>,3:52]:"`event1`.`d`"> overlap with previous <ReplaceOp@[@44,98:101='CAST',<48>,3:47]..[@51,116:116=')',<276>,3:65]:"`event1`.`d`">
java.lang.IllegalArgumentException: replace op boundaries of <ReplaceOp@[@46,103:105='`d`',<26>,3:52]..[@46,103:105='`d`',<26>,3:52]:"`event1`.`d`"> overlap with previous <ReplaceOp@[@44,98:101='CAST',<48>,3:47]..[@51,116:116=')',<276>,3:65]:"`event1`.`d`">
    at org.antlr.runtime.TokenRewriteStream.reduceToSingleOperationPerIndex(TokenRewriteStream.java:504)
    at org.antlr.runtime.TokenRewriteStream.toString(TokenRewriteStream.java:374)
    at org.antlr.runtime.TokenRewriteStream.toString(TokenRewriteStream.java:358)
    at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.saveViewDefinition(SemanticAnalyzer.java:8781)
    at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:8689)
    at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:278)
    at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:433)
    at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:337)
    at org.apache.hadoop.hive.ql.Driver.run(Driver.java:902)
    at org.apache.hadoop.hive.service.HiveServer$HiveServerHandler.execute(HiveServer.java:198)
    at org.apache.hadoop.hive.jdbc.HiveStatement.executeQuery(HiveStatement.java:192)
{noformat}

Here is a working script:
{noformat}
CREATE TABLE Event1 (d STRING, userid BIGINT, eventData1 STRING);
CREATE TABLE Event2 (d STRING, userid BIGINT, eventData2 STRING);
CREATE VIEW AllEventsTest
  AS SELECT * FROM (
    SELECT 'Event1' AS eventType, map('d', `d`, 'userid', CAST(`userid` AS STRING)) AS eventData FROM Event1
    UNION ALL
    SELECT 'Event2' AS eventType, map('d', `d`, 'userid', CAST(`userid` AS STRING)) AS eventData FROM Event2
) d;
{noformat}

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