Add basic AVRO files (translated copies of the parquet testing files to avro)

data/avro/README.md

@@ -0,0 +1,37 @@
+This directory contains AVRO files corresponding to the parquet testing files at https://github.com/apache/parquet-testing/blob/master/data/
+
+These files were created by using spark using the commands from https://gist.github.com/Igosuki/324b011f40185269d3fc552350d21744
+
+Roughly:
+```scala
+import com.github.mrpowers.spark.daria.sql.DariaWriters
+import org.apache.hadoop.fs.FileSystem
+import org.apache.hadoop.fs.Path
+import org.apache.hadoop.conf.Configuration 
+import org.apache.commons.io.FilenameUtils
+
+val fileGlobs = sc.getConf.get("spark.driver.globs")
+val dest = sc.getConf.get("spark.driver.out")
+
+val fs = FileSystem.get(new Configuration(true));
+val status = fs.globStatus(new Path(fileGlobs))
+for (fileStatus <- status) {
+    val path = fileStatus.getPath().toString()
+    try {
+        val dfin = spark.read.format("parquet").load(path)
+        val fileName = fileStatus.getPath().getName();
+        val fileNameWithOutExt = FilenameUtils.removeExtension(fileName);
+        val destination = s"${dest}/${fileNameWithOutExt}.avro"
+        println(s"Converting $path to avro at $destination")
+        DariaWriters.writeSingleFile(
+            df = dfin,
+            format = "avro",
+            sc = spark.sparkContext,
+            tmpFolder = s"/tmp/dw/${fileName}",
+            filename = destination
+        )
+    } catch {
+        case e: Throwable => println(s"failed to convert $path : ${e.getMessage}")
+    }
+}
+```