[GitHub] [iceberg] openinx commented on issue #2874: how to write order by sql

[GitBox <gi...@apache.org>]

openinx commented on issue #2874:
URL: https://github.com/apache/iceberg/issues/2874#issuecomment-887390581


   @julianjsynnex , the correct way to create a spark table with sort order columns is: 
   
   Step.1  start a spark-sql:
   
   ```bash
   ./bin/spark-sql --jars /Users/openinx/test/apache-iceberg-0.12.0-1.0.0/spark3-runtime/build/libs/iceberg-spark3-runtime-0.12.0-1.0.0.jar \
       --conf spark.sql.extensions=org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions \
       --conf spark.sql.catalog.local=org.apache.iceberg.spark.SparkCatalog \
       --conf spark.sql.catalog.local.type=hadoop \
       --conf spark.sql.catalog.local.warehouse=file:///Users/openinx/test/spark-warehouse
   ```
   
   Step.2  create table
   
   ```sql
   CREATE TABLE local.default.sample (
       id   BIGINT,
       data STRING
   ) USING iceberg ;
   ```
   
   Step.3 Alter the table with sort-order columns: 
   
   ```sql
   ALTER TABLE local.default.sample WRITE ORDERED BY (data, id);
   ```
   
   Finally,  you can see the sort-order specification in `sample` table's metadata: 
   
   ```json
   "default-sort-order-id" : 1,
     "sort-orders" : [ {
       "order-id" : 0,
       "fields" : [ ]
     }, {
       "order-id" : 1,
       "fields" : [ {
         "transform" : "identity",
         "source-id" : 2,
         "direction" : "asc",
         "null-order" : "nulls-first"
       }, {
         "transform" : "identity",
         "source-id" : 1,
         "direction" : "asc",
         "null-order" : "nulls-first"
       } ]
     } ],
   ```


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