SNOW-1786156: Replace raw asserts with exceptions (#1953)

src/main/java/net/snowflake/client/jdbc/SnowflakeFileTransferAgent.java

@@ -925,11 +925,13 @@ private void parseCommand() throws SnowflakeSQLException {
 
     // get source file locations as array (apply to both upload and download)
     JsonNode locationsNode = jsonNode.path("data").path("src_locations");
+    if (!locationsNode.isArray()) {
+      throw new SnowflakeSQLException(
+          queryID, ErrorCode.INTERNAL_ERROR, "src_locations must be an array");
+    }
 
     queryID = jsonNode.path("data").path("queryId").asText();
 
-    assert locationsNode.isArray();
-
     String[] src_locations;
 
     try {
@@ -1459,7 +1461,13 @@ public static List<SnowflakeFileTransferMetadata> getFileTransferMetadatas(
     }
 
     // For UPLOAD we expect encryptionMaterial to have length 1
-    assert encryptionMaterial.size() == 1;
+    if (encryptionMaterial.size() != 1) {
+      throw new SnowflakeSQLException(
+          queryId,
+          ErrorCode.INTERNAL_ERROR,
+          "Encryption material for UPLOAD should have size 1 but have "
+              + encryptionMaterial.size());
+    }
 
     final Set<String> sourceFiles = expandFileNames(srcLocations, queryId);