[DRILL-364] Casting to VarChar throws error CompileException

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Assignee: Jinfeng Ni
• Reporter: Mehant Baid
• Created: 11/Feb/14 06:42
• Updated: 31/Jul/14 06:33
• Resolved: 04/Mar/14 16:47

Description

This can be reproduced using the below physical plan:

{
head:{
type:"APACHE_DRILL_PHYSICAL",
version:"1",
generator:

{ type:"manual" }

},
graph:[
{
@id:1,
pop:"json-scan",
entries: [

{ path : "/tmp/scan.json" }

],
storageengine:

{ "type": "json", "dfsName": "file:///" }

},
{
pop:"project",
@id:2,
child: 1,
exprs: [

{ ref: "VarCharCast", expr: "cast(integer as varchar(30))" }

]
},

{ @id: 3, child: 2, pop: "screen" }

]
}

The input file, "/tmp/scan.json" is as follows
{
"integer" : 2008
}

It fails with the error: "org.codehaus.commons.compiler.CompileException
Line 55, Column 38: No applicable constructor/method found for actual parameters"

From the error, its clear that its not able to find a method. The line its complaining about is:
vv6 .getMutator().set((outIndex), out5);

vv6 is a VarCharVector and out5 is a NullableVarCharHolder. So its unable to find a set() function with parameters (int, NullableVarCharHolder). We do have a function in VarCharVector that matches the required signature but its 'protected' hence cannot be called from here. The only way to call that function is from within the set function of NullableVarCharVector.

Looks like a minor bug in the generated code for project, vv6 should be declared a NullableVarCharVector.