cloud-fan commented on code in PR #36066:
URL: https://github.com/apache/spark/pull/36066#discussion_r844871523
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/numberFormatExpressions.scala:
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@@ -22,48 +22,61 @@ 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)
- '$': value with a leading dollar sign (only allowed once)
+ _FUNC_(expr, fmt) - Convert string 'expr' to a number based on the string
format 'fmt'.
+ Throws an exception if the conversion fails. The format can consist of
the following
+ characters, case insensitive:
+ '0' or '9': Specifies an expected digit between 0 and 9. A 0 to the
left of the decimal
+ point indicates that 'expr' must have at least as many digits. A
leading 9 indicates
+ that 'expr' may omit these digits. For any combination of digits 0
and/or 9, the behavior
+ is decided by the left-most digit. 'expr' must not be larger than
the number of digits
+ allowed to the left of the decimal point per the format string.
Digits in the format
+ string to the right of the decimal indicate the most digits 'expr'
may have to the right
+ of the decimal point.
+ '.' or 'D': Specifies the position of the decimal point (optional,
only allowed once).
+ ',' or 'G': Specifies the position of the grouping (thousands)
separator (,). There must be
+ one or more 0 or 9 to the left of the rightmost grouping separator.
'expr' must match the
+ grouping separator relevant for the size of the number.
+ '$': Specifies the location of the $ currency sign. This character
may only be specified
+ once.
+ 'S': Specifies the position of a '+' or '-' sign (optional, only
allowed once).
+ 'MI': Only allowed at the end of the format string; specifies that
'expr' has an optional
Review Comment:
seems like `MI` and `S` have no difference when parsing, the only difference
is when printing (`to_char` function), `MI` prints a space for positive
numbers, while `S` prints `+`.
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