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[SPARK-51977] Improve SparkSQLRepl to support multiple lines #102

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[SPARK-51977] Improve SparkSQLRepl to support multiple lines #102

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23 changes: 23 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -182,6 +182,29 @@ spark-sql (default)> DROP DATABASE db1 CASCADE;
spark-sql (default)> exit;
```

Apache Spark 4 supports [SQL Pipe Syntax](https://dist.apache.org/repos/dist/dev/spark/v4.0.0-rc4-docs/_site/sql-pipe-syntax.html).

```
$ swift run
...
Build of product 'SparkSQLRepl' complete! (2.33s)
Connected to Apache Spark 4.0.0 Server
spark-sql (default)>
FROM ORC.`/opt/spark/examples/src/main/resources/users.orc`
|> AGGREGATE COUNT(*) cnt
GROUP BY name
|> ORDER BY cnt DESC, name ASC
;
+------+---+
| name|cnt|
+------+---+
|Alyssa| 1|
| Ben| 1|
+------+---+

Time taken: 159 ms
```

You can use `SPARK_REMOTE` to specify the [Spark Connect connection string](https://spark.apache.org/docs/latest/spark-connect-overview.html#set-sparkremote-environment-variable) in order to provide more options.

```bash
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9 changes: 7 additions & 2 deletions Sources/SparkSQLRepl/main.swift
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Expand Up @@ -26,15 +26,20 @@ let spark = try await SparkSession.builder.getOrCreate()
print("Connected to Apache Spark \(await spark.version) Server")

var isRunning = true
var lines = ""
while isRunning {
print("spark-sql (\(try await spark.catalog.currentDatabase()))> ", terminator: "")
if lines.isEmpty {
print("spark-sql (\(try await spark.catalog.currentDatabase()))> ", terminator: "")
}
guard let input = readLine() else {
isRunning = false
break
}
lines += input + " "

let matches = input.matches(of: statement)
let matches = lines.matches(of: statement)
for match in matches {
lines = ""
switch match.1 {
case "exit":
isRunning = false
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