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https://issues.apache.org/jira/browse/HIVE-8433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14178994#comment-14178994
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Sergey Shelukhin commented on HIVE-8433:
----------------------------------------
Btw, I'm going to update the patch to deal with more cases, but it will still
be the same; applicability of RR check will merely be expanded. So it can be
reviewed before that.
> CBO loses a column during AST conversion
> ----------------------------------------
>
> Key: HIVE-8433
> URL: https://issues.apache.org/jira/browse/HIVE-8433
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Priority: Critical
> Attachments: HIVE-8433.01.patch, HIVE-8433.02.patch, HIVE-8433.patch
>
>
> {noformat}
> SELECT
> CAST(value AS BINARY),
> value
> FROM src
> ORDER BY value
> LIMIT 100
> {noformat}
> returns only one column.
> Final CBO plan is
> {noformat}
> HiveSortRel(sort0=[$1], dir0=[ASC]): rowcount = 500.0, cumulative cost =
> {24858.432393688767 rows, 500.0 cpu, 0.0 io}, id = 44
> HiveProjectRel(value=[CAST($0):BINARY(2147483647) NOT NULL],
> value1=[$0]): rowcount = 500.0, cumulative cost = {0.0 rows, 0.0 cpu, 0.0
> io}, id = 42
> HiveProjectRel(value=[$1]): rowcount = 500.0, cumulative cost = {0.0
> rows, 0.0 cpu, 0.0 io}, id = 40
> HiveTableScanRel(table=[[default.src]]): rowcount = 500.0, cumulative
> cost = {0}, id = 0
> {noformat}
> but the resulting AST has only one column. Must be some bug in conversion,
> probably related to the name collision in the schema, judging by the alias of
> the column for the binary-cast value in the AST
> {noformat}
> TOK_QUERY
> TOK_FROM
> TOK_SUBQUERY
> TOK_QUERY
> TOK_FROM
> TOK_TABREF
> TOK_TABNAME
> default
> src
> src
> TOK_INSERT
> TOK_DESTINATION
> TOK_DIR
> TOK_TMP_FILE
> TOK_SELECT
> TOK_SELEXPR
> .
> TOK_TABLE_OR_COL
> src
> value
> value
> $hdt$_0
> TOK_INSERT
> TOK_DESTINATION
> TOK_DIR
> TOK_TMP_FILE
> TOK_SELECT
> TOK_SELEXPR
> TOK_FUNCTION
> TOK_BINARY
> .
> TOK_TABLE_OR_COL
> $hdt$_0
> value
> value
> TOK_ORDERBY
> TOK_TABSORTCOLNAMEASC
> TOK_TABLE_OR_COL
> value
> TOK_LIMIT
> 100
> {noformat}
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