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feat: parse BigQuery JSON string literals as implicit casts #2488

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manticore-projects merged 1 commit into from
Aug 19, 2026
+14 −0
Merged

feat: parse BigQuery JSON string literals as implicit casts #2488

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2 changes: 2 additions & 0 deletions src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt
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Original file line number Diff line number Diff line change
Expand Up @@ -477,6 +477,8 @@ public class CCJSqlParser extends AbstractJSqlParser<CCJSqlParser> {
// DT_ZONE (TIMESTAMP WITH TIME ZONE / WITHOUT TIME ZONE) is also a valid
// implicit cast type prefix handled by DataType(), but distinct from DATA_TYPE.
if (k1 == DT_ZONE) return true;
// BigQuery JSON 'literal' - JSON lexes as K_JSON, but DataType() accepts it
if (k1 == K_JSON) return getToken(2).kind == S_CHAR_LITERAL;
if (k1 != DATA_TYPE) return false;
int k2 = getToken(2).kind;
if (k2 != OPENING_BRACKET) return true; // DATA_TYPE literal - simple cast
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12 changes: 12 additions & 0 deletions src/test/java/net/sf/jsqlparser/expression/CastExpressionTest.java
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Expand Up @@ -52,6 +52,18 @@ void testImplicitCast() throws JSQLParserException {
Assertions.assertTrue(select.getSelectItem(0).getExpression() instanceof CastExpression);
}

@Test
void testImplicitCastJsonLiteral() throws JSQLParserException {
String sqlStr = "SELECT JSON '{\"name\": \"Jakob\"}'";
PlainSelect select = (PlainSelect) TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);

Assertions.assertTrue(select.getSelectItem(0).getExpression() instanceof CastExpression);

// BigQuery wraps JSON literals in functions, e. g. BOOL(JSON 'true')
sqlStr = "SELECT BOOL(JSON 'true') AS vacancy";
TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
}

@Test
void testImplicitCastTimestampIssue1364() throws JSQLParserException {
String sqlStr = "SELECT TIMESTAMP WITH TIME ZONE '2004-10-19 10:23:54+02'";
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