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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/49619/
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Review request for hive and Carl Steinbach.
Repository: hive-git
Description
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Problem Statement:
When we are working with complext structure of data like avro.
Most of the times we are encountering array contains multiple tuples and each
tuple have struct schema.
Suppose here struct schema is like below:
{
"name": "employee",
"type": [{
"type": "record",
"name": "Employee",
"namespace": "com.company.Employee",
"fields": [{
"name": "empId",
"type": "int"
}, {
"name": "empName",
"type": "string"
}, {
"name": "age",
"type": "int"
}, {
"name": "salary",
"type": "double"
}]
}]
}
Then while running our hive query complex array looks like array of employee
objects.
Example:
//(array<struct<empId,empName,age,salary>>)
Array[Employee(100,Foo,20,20990),Employee(500,Boo,30,50990),Employee(700,Harry,25,40990),Employee(100,Tom,35,70990)]
When we are implementing business use cases day to day life we are encountering
problems like sorting a tuple array by specific field[s] like empIdm,salary,etc.
Proposal:
I have developed a udf 'sort_array_field' which will sort a tuple array by one
or more fields in naural order.
Example:
1.Select
sort_array_field(array[struct(100,Foo,20,20990),struct(500,Boo,30,50990),struct(700,Harry,25,40990),struct(100,Tom,35,70990)],"Salary");
output:
array[struct(100,Foo,20,20990),struct(700,Harry,25,40990),struct(500,Boo,30,50990),struct(100,Tom,35,70990)]
2.Select
sort_array_field(array[struct(100,Foo,20,20990),struct(500,Boo,30,80990),struct(500,Boo,30,50990),struct(700,Harry,25,40990),struct(100,Tom,35,70990)],"Name","Salary");
output:
array[struct(500,Boo,30,50990),struct(500,Boo,30,80990),struct(100,Foo,20,20990),struct(700,Harry,25,40990),struct(100,Tom,35,70990)]
3.Select
sort_array_field(array[struct(100,Foo,20,20990),struct(500,Boo,30,50990),struct(700,Harry,25,40990),struct(100,Tom,35,70990)],"Name","Salary","Age);
output:
array[struct(500,Boo,30,50990),struct(500,Boo,30,80990),struct(100,Foo,20,20990),struct(700,Harry,25,40990),struct(100,Tom,35,70990)]
Diffs
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itests/src/test/resources/testconfiguration.properties 1ab914d
ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java 2f4a94c
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFSortArrayField.java
PRE-CREATION
ql/src/test/org/apache/hadoop/hive/ql/udf/generic/TestGenericUDFSortArrayField.java
PRE-CREATION
ql/src/test/queries/clientnegative/udf_sort_array_field_wrong1.q PRE-CREATION
ql/src/test/queries/clientnegative/udf_sort_array_field_wrong2.q PRE-CREATION
ql/src/test/queries/clientpositive/udf_sort_array_field.q PRE-CREATION
ql/src/test/results/clientnegative/udf_sort_array_field_wrong1.q.out
PRE-CREATION
ql/src/test/results/clientnegative/udf_sort_array_field_wrong2.q.out
PRE-CREATION
ql/src/test/results/clientpositive/udf_sort_array_field.q.out PRE-CREATION
Diff: https://reviews.apache.org/r/49619/diff/
Testing
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Junit test cases and query.q files are attached
Thanks,
Simanchal Das
