Added exception on unsupported uri schema.

CHANGES.txt

@@ -5,6 +5,8 @@ Changes for Crate
 Unreleased
 ==========
 
+ - Using unsupported URI schema in COPY FROM statement now results in an error.
+
  - Fixed an issue with the LIKE predicate if used on a system table where it
    wouldn't match if the content contains newline characters
 

sql/src/main/java/io/crate/operation/collect/files/FileReadingCollector.java

@@ -96,6 +96,9 @@ public FileReadingCollector(String fileUri,
             if (this.fileUri.getScheme().equals("file") && !this.fileUri.getSchemeSpecificPart().startsWith("///")) {
                 throw new IllegalArgumentException("Invalid fileURI");
             }
+            if (!this.fileUri.getScheme().equals("file") && !this.fileUri.getScheme().equals("s3") ) {
+                throw new IllegalArgumentException("URI scheme is not supported");
+            }
         }
         this.downstream = downstream.registerUpstream(this);
         this.compressed = compression != null && compression.equalsIgnoreCase("gzip");

sql/src/test/java/io/crate/operation/collect/files/FileReadingCollectorTest.java

@@ -166,6 +166,13 @@ public void testCollectWithEmptyLine() throws Throwable {
         assertCorrectResult(projector.result().get());
     }
 
+    @Test
+    public void unsupportedURITest() throws Throwable {
+        expectedException.expect(IllegalArgumentException.class);
+        expectedException.expectMessage("URI scheme is not supported");
+        getObjects("https://crate.io/docs/en/latest/sql/reference/copy_from.html");
+    }
+
     private void assertCorrectResult(Bucket rows) throws Throwable {
         Iterator<Row> it = rows.iterator();
         assertThat(it.next(), isRow("{\"name\": \"Arthur\", \"id\": 4, \"details\": {\"age\": 38}}"));