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new d172a62127a6 [SPARK-57245][SQL] Simplify FormatNumber codegen by
extracting a static Java helper
d172a62127a6 is described below
commit d172a62127a6481eb5b9d07c608876307550966e
Author: YangJie <[email protected]>
AuthorDate: Thu Jun 4 13:26:32 2026 +0800
[SPARK-57245][SQL] Simplify FormatNumber codegen by extracting a static
Java helper
### What changes were proposed in this pull request?
This is a sub-task of
[SPARK-56908](https://issues.apache.org/jira/browse/SPARK-56908) (reduce
generated Java size in whole-stage codegen).
For an integer `d`, `FormatNumber.doGenCode` inlined the number-pattern
build (the default grouping pattern followed by `d` decimal places, applied to
a `DecimalFormat`), an exact transliteration of the same block in
`nullSafeEval`. The codegen also threaded a `pattern` `StringBuilder` through
mutable state:
```java
if (d >= 0) {
pattern.delete(0, pattern.length());
if (d != lastDValue) {
pattern.append("#,###,###,###,###,###,##0");
if (d > 0) {
pattern.append(".");
for (int i = 0; i < d; i++) {
pattern.append("0");
}
}
lastDValue = d;
numberFormat.applyLocalizedPattern(pattern.toString());
}
...
}
```
This PR moves the pattern build into a static helper
`ExpressionImplUtils.applyNumberFormatScale(DecimalFormat, String
defaultFormat, int scale)` that both `eval` and `doGenCode` call, mirroring the
`ascii` helper added in SPARK-57208. The integer-`d` codegen becomes:
```java
if (d >= 0) {
if (d != lastDValue) {
lastDValue = d;
ExpressionImplUtils.applyNumberFormatScale(numberFormat,
"#,###,###,###,###,###,##0", d);
}
...
}
```
This removes the duplicated block, drops the `pattern` `StringBuilder` (an
instance field in `eval` and a mutable-state slot in codegen), and removes a
dead `pattern.delete(...)` that the string-pattern branch never read. The
string-pattern path and the per-`d` caching (only rebuild when `d` changes) are
unchanged.
### Why are the changes needed?
To reduce the size of the generated Java in whole-stage codegen, as tracked
by SPARK-56908. The integer-`d` branch shrinks to a single helper call, and the
generated class drops one mutable-state field (the `pattern` `StringBuilder`).
The same block is also deduplicated from `eval`.
### Does this PR introduce _any_ user-facing change?
No. This is a codegen/refactor change; `eval`, `nullable`, `dataType`, and
results are unchanged, so SQL output and golden files are unaffected.
### How was this patch tested?
Existing tests, which exercise the changed path in both interpreted and
codegen modes:
- `StringExpressionsSuite` "format_number / FormatNumber" (catalyst) covers
integer `d` with scale > 0, scale = 0, and scale < 0 (null) across all numeric
input types, plus the string-pattern path and null cases.
- `StringFunctionsSuite` "number format function" (sql/core).
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code (Claude Opus 4.8)
Closes #56299 from LuciferYang/formatnumber-codegen-helper.
Authored-by: YangJie <[email protected]>
Signed-off-by: yangjie01 <[email protected]>
---
.../catalyst/expressions/ExpressionImplUtils.java | 19 ++++++++++
.../catalyst/expressions/stringExpressions.scala | 41 +++-------------------
2 files changed, 23 insertions(+), 37 deletions(-)
diff --git
a/sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/ExpressionImplUtils.java
b/sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/ExpressionImplUtils.java
index 1a49cf6bb52b..d44922261674 100644
---
a/sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/ExpressionImplUtils.java
+++
b/sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/ExpressionImplUtils.java
@@ -22,6 +22,7 @@ import java.security.GeneralSecurityException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.text.BreakIterator;
+import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
@@ -448,4 +449,22 @@ public class ExpressionImplUtils {
return 0;
}
}
+
+ /**
+ * Builds the number pattern for the given scale (the default grouping
pattern followed by
+ * {@code scale} decimal places) and applies it to the given {@link
DecimalFormat}. Shared by the
+ * FormatNumber expression's eval and codegen paths so the generated Java is
a single call and
+ * the pattern buffer does not need to be threaded through mutable state.
+ */
+ public static void applyNumberFormatScale(
+ DecimalFormat numberFormat, String defaultFormat, int scale) {
+ StringBuilder pattern = new StringBuilder(defaultFormat);
+ if (scale > 0) {
+ pattern.append('.');
+ for (int i = 0; i < scale; i++) {
+ pattern.append('0');
+ }
+ }
+ numberFormat.applyLocalizedPattern(pattern.toString());
+ }
}
diff --git
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
index bbc9341d8e6d..45ec0e6a8b30 100755
---
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
+++
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
@@ -17,7 +17,6 @@
package org.apache.spark.sql.catalyst.expressions
-import java.lang.{StringBuilder => JStringBuilder}
import java.nio.{ByteBuffer, CharBuffer}
import java.nio.charset.CharacterCodingException
import java.text.{DecimalFormat, DecimalFormatSymbols}
@@ -3355,11 +3354,6 @@ case class FormatNumber(x: Expression, d: Expression)
@transient
private var lastDStringValue: Option[String] = None
- // A cached DecimalFormat, for performance concern, we will change it
- // only if the d value changed.
- @transient
- private lazy val pattern: JStringBuilder = new JStringBuilder()
-
// SPARK-13515: US Locale configures the DecimalFormat object to use a dot
('.')
// as a decimal separator.
@transient
@@ -3377,31 +3371,15 @@ case class FormatNumber(x: Expression, d: Expression)
case Some(last) if last == dValue =>
// use the current pattern
case _ =>
- // construct a new DecimalFormat only if a new dValue
- pattern.delete(0, pattern.length)
- pattern.append(defaultFormat)
-
- // decimal place
- if (dValue > 0) {
- pattern.append(".")
-
- var i = 0
- while (i < dValue) {
- i += 1
- pattern.append("0")
- }
- }
-
+ // construct a new pattern only if a new dValue
lastDIntValue = Some(dValue)
-
- numberFormat.applyLocalizedPattern(pattern.toString)
+ ExpressionImplUtils.applyNumberFormatScale(numberFormat,
defaultFormat, dValue)
}
case _: StringType =>
val dValue = dObject.asInstanceOf[UTF8String].toString
lastDStringValue match {
case Some(last) if last == dValue =>
case _ =>
- pattern.delete(0, pattern.length)
lastDStringValue = Some(dValue)
if (dValue.isEmpty) {
numberFormat.applyLocalizedPattern(defaultFormat)
@@ -3433,7 +3411,6 @@ case class FormatNumber(x: Expression, d: Expression)
}
}
- val sb = classOf[JStringBuilder].getName
val df = classOf[DecimalFormat].getName
val dfs = classOf[DecimalFormatSymbols].getName
val l = classOf[Locale].getName
@@ -3445,24 +3422,14 @@ case class FormatNumber(x: Expression, d: Expression)
right.dataType match {
case IntegerType =>
- val pattern = ctx.addMutableState(sb, "pattern", v => s"$v = new
$sb();")
- val i = ctx.freshName("i")
val lastDValue =
ctx.addMutableState(CodeGenerator.JAVA_INT, "lastDValue", v =>
s"$v = -100;")
+ val utils = classOf[ExpressionImplUtils].getName
s"""
if ($d >= 0) {
- $pattern.delete(0, $pattern.length());
if ($d != $lastDValue) {
- $pattern.append("$defaultFormat");
-
- if ($d > 0) {
- $pattern.append(".");
- for (int $i = 0; $i < $d; $i++) {
- $pattern.append("0");
- }
- }
$lastDValue = $d;
- $numberFormat.applyLocalizedPattern($pattern.toString());
+ $utils.applyNumberFormatScale($numberFormat, "$defaultFormat",
$d);
}
${ev.value} =
UTF8String.fromString($numberFormat.format(${typeHelper(num)}));
} else {
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