temporary s3-select feature documentation

weed/s3api/S3SelectREADME.md

@@ -0,0 +1,47 @@
+# AWS S3 Select feature in Seaweedfs
+
+## Start weed
+
+```bash
+git checkout s3-select
+# Compile weed
+weed server -s3
+```
+
+## Install And Configure AWSCLI
+
+```bash
+pip install awscli
+aws configure // default all the way
+aws configure set default.s3.signature_version s3v4
+```
+
+## Make a bucket in S3
+
+```bash
+aws --endpoint-url http://localhost:8333 s3 mb s3://newbucketgoogle
+```
+
+## Download googleplaystore.csv
+
+Link: https://www.kaggle.com/lava18/google-play-store-apps
+
+## Copy the file to the S3 bucket
+
+```bash
+aws --endpoint-url http://localhost:8333 s3 copy google-play-store-apps/googleplaystore.csv s3://newbucketgoogle
+```
+
+## Perform S3 Select Query
+
+```bash
+aws --endpoint-url http://localhost:8333 s3api select-object-content --bucket "newbucketgoogle"    --key
+ "googleplaystore.csv"    --expression "select * from s3object limit 5"    --expression-type 'SQL'    --input-serialization '{"CSV": {"FileHeaderInfo": "USE","RecordDelimiter": "\n","FieldDelimiter": ","}, "CompressionType": "NONE"}'    --output-serialization '{"CSV": {"RecordDelimiter": "\n","FieldDelimiter": ","}}'    "sample.csv"
+```
+
+## Check out result
+
+```bash
+vim sample.csv
+```
+