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[CALCITE-7578] LIKE with empty ESCAPE might fail with StringIndexOutOfBoundsException#4989

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[CALCITE-7578] LIKE with empty ESCAPE might fail with StringIndexOutOfBoundsException#4989
snuyanzin wants to merge 1 commit into
apache:mainfrom
snuyanzin:calcite7578

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@snuyanzin snuyanzin commented Jun 4, 2026

Jira Link

CALCITE-7578

Changes Proposed

The PR improves RexSimplify for the case of LIKE with empty ESCAPE to make it not failing with StringIndexOutOfBoundsException

snuyanzin
snuyanzin commented Jun 4, 2026
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Comment thread core/src/main/java/org/apache/calcite/rex/RexSimplify.java
rexBuilder.makeLiteral(simplifyLikeString(likeStr, escape, '%'),
e.operands.get(1).getType(), true, true), escapeLiteral);
final String escapeStr = requireNonNull(escapeLiteral.getValueAs(String.class));
if (escapeStr.length() == 1) {
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@snuyanzin snuyanzin Jun 4, 2026 •
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if it not equals to 1 it will fail further with a nicer message at

calcite/core/src/main/java/org/apache/calcite/runtime/Like.java

Lines 60 to 73 in 9a03982

static String sqlToRegexLike(
String sqlPattern,
@Nullable CharSequence escapeStr) {
final char escapeChar;
if (escapeStr != null) {
if (escapeStr.length() != 1) {
throw invalidEscapeCharacter(escapeStr.toString());
}
escapeChar = escapeStr.charAt(0);
} else {
escapeChar = 0;
}
return sqlToRegexLike(sqlPattern, escapeChar);
}

xuzifu666
xuzifu666 approved these changes Jun 4, 2026
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LGTM, after the CI passed.

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sonarqubecloud Bot commented Jun 4, 2026

Quality Gate Passed Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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@xuzifu666 xuzifu666 xuzifu666 approved these changes

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@snuyanzin @xuzifu666