About Raw Query Parameters

[李世明]

Hi:

Use Raw Query Parameters to pass in an array. How can you use cursors to refer 
to elements of an array in a function?

For example，How do I get $a[0] to work properly：
"params":{
    "a":["1”,  "2”, "3"],
    "q": "*:*",
    "fl": "$a, $a[0]"  
}


Thank you very much