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https://issues.apache.org/jira/browse/HIVE-5802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13837072#comment-13837072
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Xuefu Zhang commented on HIVE-5802:
-----------------------------------
This is fixed in HIVE-5706. Here is the new console output:
{code}
hive> explain select pow(dd, 2) from test limit 1;
OK
ABSTRACT SYNTAX TREE:
(TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME test1))) (TOK_INSERT
(TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION
pow (TOK_TABLE_OR_COL dd) 2))) (TOK_LIMIT 1)))
STAGE DEPENDENCIES:
Stage-1 is a root stage
Stage-0 is a root stage
STAGE PLANS:
Stage: Stage-1
Map Reduce
Alias -> Map Operator Tree:
test1
TableScan
alias: test1
Select Operator
expressions:
expr: power(dd, 2)
type: double
outputColumnNames: _col0
Limit
File Output Operator
compressed: false
GlobalTableId: 0
table:
input format: org.apache.hadoop.mapred.TextInputFormat
output format:
org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
Stage: Stage-0
Fetch Operator
limit: 1
{code}
> Hive UDF pow limits the second input to integer when the first input is a
> decimal
> ---------------------------------------------------------------------------------
>
> Key: HIVE-5802
> URL: https://issues.apache.org/jira/browse/HIVE-5802
> Project: Hive
> Issue Type: Improvement
> Components: Types, UDF
> Affects Versions: 0.12.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
>
> For example,
> {code}
> hive> desc test;
> OK
> i int None
> b boolean None
> d double None
> s string None
> dec decimal(5,2) None
> hive> explain select pow(dec, 2.5) from test;
> FAILED: SemanticException [Error 10014]: Line 1:15 Wrong arguments '2.5': No
> matching method for class org.apache.hadoop.hive.ql.udf.UDFPower with
> (decimal(5,2), double). Possible choices: _FUNC_(decimal(65,30), int)
> _FUNC_(double, double) _FUNC_(double, int)
> {code}
> This seems too restrictive. MySQL, on the other hand, supports fractional
> power as the second input.
> {code}
> mysql> select pow(d, 2.5) from test;
> mysql> desc test;
> +-------+--------------+------+-----+---------+-------+
> | Field | Type | Null | Key | Default | Extra |
> +-------+--------------+------+-----+---------+-------+
> | i | int(11) | YES | | NULL | |
> | b | tinyint(1) | YES | | NULL | |
> | d | double | YES | | NULL | |
> | s | varchar(5) | YES | | NULL | |
> | dd | decimal(5,2) | YES | | NULL | |
> +-------+--------------+------+-----+---------+-------+
> 5 rows in set (0.00 sec)
> mysql> select pow(dd, 2.5) from test;
> +-------------------+
> | pow(dd, 2.5) |
> +-------------------+
> | 2570.215713318881 |
> +-------------------+
> 1 row in set (0.00 sec)
> {code}
> Hive should also support this.
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