fixed crash for empty csv

Jolanrensen · Jolanrensen · commit 1a5002c2c3e8 · 2024-08-23T14:58:06.000+02:00
diff --git a/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/csv.kt b/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/csv.kt
@@ -345,7 +345,7 @@ public fun DataFrame.Companion.readDelim(
     }
 
     val columnNames = csvParser.headerNames.takeIf { it.isNotEmpty() }
-        ?: (1..records[0].count()).map { index -> "X$index" }
+        ?: (1..(records.firstOrNull()?.count() ?: 0)).map { index -> "X$index" }
 
     val generator = ColumnNameGenerator()
     val uniqueNames = columnNames.map { generator.addUnique(it) }

Original file line number	Diff line number	Diff line change
`@@ -345,7 +345,7 @@ public fun DataFrame.Companion.readDelim(`
`345`	`345`	`}`
`346`	`346`
`347`	`347`	`val columnNames = csvParser.headerNames.takeIf { it.isNotEmpty() }`
`348`		`- ?: (1..records[0].count()).map { index -> "X$index" }`
	`348`	`+ ?: (1..(records.firstOrNull()?.count() ?: 0)).map { index -> "X$index" }`
`349`	`349`
`350`	`350`	`val generator = ColumnNameGenerator()`
`351`	`351`	`val uniqueNames = columnNames.map { generator.addUnique(it) }`