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From "Zhenxiao Luo (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2717) Could not Name UDF using Reserved Word
Date Fri, 13 Jan 2012 07:33:40 GMT
Could not Name UDF using Reserved Word
--------------------------------------

                 Key: HIVE-2717
                 URL: https://issues.apache.org/jira/browse/HIVE-2717
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
            Reporter: Zhenxiao Luo
            Assignee: Zhenxiao Luo


Parser/SemanticAnalyzer prevent Naming UDF using Reserved Word(eg. sort, format)

Even with the following changes in Hive Grammer:

[~/Code/hive]git diff ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g
diff --git a/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g b/ql/src/java/org/apache/hadoop/h
index 888bf47..ec256de 100644
--- a/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g
+++ b/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g
@@ -1816,7 +1816,7 @@ functionName
 @init { msgs.push("function name"); }
 @after { msgs.pop(); }
     : // Keyword IF is also a function name
-    Identifier | KW_IF | KW_ARRAY | KW_MAP | KW_STRUCT | KW_UNIONTYPE
+    Identifier | KW_IF | KW_ARRAY | KW_MAP | KW_STRUCT | KW_UNIONTYPE | KW_SORT
     ;
 
 castExpression
@@ -2091,6 +2091,7 @@ sysFuncNames
     | KW_MAP
     | KW_STRUCT
     | KW_UNIONTYPE
+    | KW_SORT
     | EQUAL
     | NOTEQUAL
     | LESSTHANOREQUALTO


Semantic analysis always reports error:

-- Evaluate function against STRING valued keys
EXPLAIN
SELECT sort(array("b", "d", "c", "a")) FROM src LIMIT 1
2012-01-09 11:31:55,134 INFO  parse.ParseDriver (ParseDriver.java:parse(426)) - Parsing command:

-- Evaluate function against STRING valued keys
EXPLAIN
SELECT sort(array("b", "d", "c", "a")) FROM src LIMIT 1
2012-01-09 11:31:55,146 INFO  parse.ParseDriver (ParseDriver.java:parse(443)) - Parse Completed
2012-01-09 11:31:55,147 INFO  parse.SemanticAnalyzer (SemanticAnalyzer.java:analyzeInternal(7445))
- Starting Semantic Analysis
2012-01-09 11:31:55,148 INFO  parse.SemanticAnalyzer (SemanticAnalyzer.java:analyzeInternal(7475))
- Completed phase 1 of Semantic Analysis
2012-01-09 11:31:55,148 INFO  parse.SemanticAnalyzer (SemanticAnalyzer.java:getMetaData(942))
- Get metadata for source tables
2012-01-09 11:31:55,149 INFO  metastore.HiveMetaStore (HiveMetaStore.java:logInfo(528)) -
0: get_table : db=default tbl=src
2012-01-09 11:31:55,200 INFO  hive.log (MetaStoreUtils.java:getDDLFromFieldSchema(457)) -
DDL: struct src { string key, string value}
2012-01-09 11:31:55,200 DEBUG lazy.LazySimpleSerDe (LazySimpleSerDe.java:initialize(195))
- org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe initialized with: columnNames=[key, value]
columnTypes=[string, string] separator=[[B@3bb20e65] nullstring=\N lastColumnTakesRest=false
2012-01-09 11:31:55,200 INFO  parse.SemanticAnalyzer (SemanticAnalyzer.java:getMetaData(1021))
- Get metadata for subqueries
2012-01-09 11:31:55,201 INFO  parse.SemanticAnalyzer (SemanticAnalyzer.java:getMetaData(1035))
- Get metadata for destination tables
2012-01-09 11:31:55,201 INFO  parse.SemanticAnalyzer (SemanticAnalyzer.java:analyzeInternal(7478))
- Completed getting MetaData in Semantic Analysis
2012-01-09 11:31:55,203 INFO  hive.log (MetaStoreUtils.java:getDDLFromFieldSchema(457)) -
DDL: struct src { string key, string value}
2012-01-09 11:31:55,203 DEBUG lazy.LazySimpleSerDe (LazySimpleSerDe.java:initialize(195))
- org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe initialized with: columnNames=[key, value]
columnTypes=[string, string] separator=[[B@12e84396] nullstring=\N lastColumnTakesRest=false
2012-01-09 11:31:55,222 DEBUG parse.SemanticAnalyzer (SemanticAnalyzer.java:genTablePlan(6598))
- Created Table Plan for src org.apache.hadoop.hive.ql.exec.TableScanOperator@5e9ea579
2012-01-09 11:31:55,223 DEBUG parse.SemanticAnalyzer (SemanticAnalyzer.java:genSelectPlan(2117))
- tree: (TOK_SELECT (TOK_SELEXPR (TOK_FUNCTION sort (TOK_FUNCTION array "b" "d" "c" "a"))))
2012-01-09 11:31:55,225 DEBUG parse.SemanticAnalyzer (SemanticAnalyzer.java:genSelectPlan(2222))
- genSelectPlan: input = src{(key,key: string)(value,value: string)(block__offset__inside__file,BLOCK__OFFSET__INSIDE__FILE:
bigint)(input__file__name,INPUT__FILE__NAME: string)}
2012-01-09 11:31:55,234 ERROR ql.Driver (SessionState.java:printError(380)) - FAILED: Error
in semantic analysis: Line 5:7 Arguments length mismatch 'sort': The function SORT(array(obj1,
obj2,...)) needs one argument.
org.apache.hadoop.hive.ql.parse.SemanticException: Line 5:7 Arguments length mismatch 'sort':
The function SORT(array(obj1, obj2,...)) needs one argument.
    at org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory$DefaultExprProcessor.process(TypeCheckProcFactory.java:810)
    at org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:89)
    at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:88)
    at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.walk(DefaultGraphWalker.java:125)
    at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:102)
    at org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory.genExprNode(TypeCheckProcFactory.java:161)
    at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genExprNodeDesc(SemanticAnalyzer.java:7708)
    at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genSelectPlan(SemanticAnalyzer.java:2301


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