Code from my [blog post](https://chuvash.eu/2020/01/09/filtering-azure-table-data-directly-in-the-azure-function-binding/)

binding-filter-function.json

{
  "bindings": [
    {
      "authLevel": "anonymous",
      "type": "httpTrigger",
      "direction": "in",
      "name": "req",
      "methods": ["options", "get"]
    },
    {
      "type": "http",
      "direction": "out",
      "name": "res"
    },
    {
      "type": "table",
      "name": "inputTable",
      "tableName": "metadata",
      "connection": "AzureWebJobsStorage",
      "direction": "in",
      "filter": "(PartitionKey eq '{package}')"
    }
  ]
}

binding-filter-index.ts

module.exports = async function(context, req) {
  context.res = {
    body: context.bindings.inputTable
  };
};