dtenedor commented on code in PR #36066:
URL: https://github.com/apache/spark/pull/36066#discussion_r844215807
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/numberFormatExpressions.scala:
##########
@@ -22,48 +22,58 @@ import java.util.Locale
import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext,
CodeGenerator, ExprCode}
import org.apache.spark.sql.catalyst.expressions.codegen.Block.BlockHelper
-import org.apache.spark.sql.catalyst.util.NumberFormatter
+import org.apache.spark.sql.catalyst.util.ToNumberParser
import org.apache.spark.sql.types.{DataType, StringType}
import org.apache.spark.unsafe.types.UTF8String
/**
- * A function that converts string to numeric.
+ * A function that converts strings to decimal values, returning an exception
if the input string
+ * fails to match the format string.
*/
@ExpressionDescription(
usage = """
- _FUNC_(strExpr, formatExpr) - Convert `strExpr` to a number based on the
`formatExpr`.
- The format can consist of the following characters:
- '0' or '9': digit position
- '.' or 'D': decimal point (only allowed once)
- ',' or 'G': group (thousands) separator
- '-' or 'S': sign anchored to number (only allowed once)
- '$': value with a leading dollar sign (only allowed once)
+ _FUNC_(expr, fmt) - Convert string 'expr' to a number based on the string
format 'fmt'.
+ Throws an exception if the conversion fails. The format can consist of
the following
+ characters, case insensitive:
+ '0' or '9': Specifies an expected digit between 0 and 9. A 0 to the
left of the decimal
+ point indicates that 'expr' must have at least as many digits. A
leading 9 indicates
+ that 'expr' may omit these digits. 'expr' must not be larger than
the number of digits
Review Comment:
Good point. This PR decides the behavior by the leftmost digit (whether
before or after the decimal point) so I updated this string to mention that for
now. I like the idea of forbidding mixing 0 and 9 as well, if @srielau
recommends this, I can make that change.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
