feat: support PostgreSQL COPY WITH options

Signed-off-by: minleejae <mmj9808@gmail.com>

Author: minleejae

src/main/java/net/sf/jsqlparser/statement/CopyStatement.java

@@ -16,10 +16,12 @@
 import net.sf.jsqlparser.statement.select.Select;
 
 import java.util.List;
+import java.util.function.Consumer;
 
 /**
  * {@code COPY table [(columns)] FROM path [(options)]} and
- * {@code COPY {table | (query)} TO path [(options)]}, DuckDB's bulk import and export statement.
+ * {@code COPY {table | (query)} TO path [(options)]}, the bulk import and export statement in
+ * DuckDB and PostgreSQL.
  *
  * @see <a href="https://duckdb.org/docs/stable/sql/statements/copy">COPY</a>
  */
@@ -30,6 +32,7 @@ public class CopyStatement implements Statement {
     private boolean from;
     private String path;
     private List<String> options;
+    private boolean withKeyword;
 
     public Table getTable() {
         return table;
@@ -110,17 +113,41 @@ public CopyStatement withOptions(List<String> options) {
         return this;
     }
 
+    /** Whether the option list is introduced by the optional WITH keyword. */
+    public boolean isWithKeyword() {
+        return withKeyword;
+    }
+
+    public void setWithKeyword(boolean withKeyword) {
+        this.withKeyword = withKeyword;
+    }
+
+    public CopyStatement withWithKeyword(boolean withKeyword) {
+        setWithKeyword(withKeyword);
+        return this;
+    }
+
     public StringBuilder appendTo(StringBuilder builder) {
+        return appendTo(builder, builder::append);
+    }
+
+    /** Renders the query through the caller's select writer. */
+    public StringBuilder appendTo(StringBuilder builder, Consumer<Select> selectPrinter) {
         builder.append("COPY ");
         if (select != null) {
-            builder.append("(").append(select).append(")");
+            builder.append('(');
+            selectPrinter.accept(select);
+            builder.append(')');
         } else {
             builder.append(table);
             if (columns != null && !columns.isEmpty()) {
                 builder.append(" (").append(columns).append(")");
             }
         }
         builder.append(from ? " FROM " : " TO ").append(path);
+        if (withKeyword) {
+            builder.append(" WITH");
+        }
         if (options != null && !options.isEmpty()) {
             builder.append(" ").append(PlainSelect.getStringList(options, true, true));
         }

src/main/java/net/sf/jsqlparser/util/deparser/StatementDeParser.java

@@ -624,7 +624,8 @@ public <S> StringBuilder visit(DeallocateStatement deallocateStatement, S contex
 
     @Override
     public <S> StringBuilder visit(CopyStatement copyStatement, S context) {
-        copyStatement.appendTo(builder);
+        copyStatement.appendTo(builder,
+                select -> select.accept((SelectVisitor<?>) selectDeParser, context));
         return builder;
     }
 

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -4685,10 +4685,18 @@ CopyStatement CopyStatement() #CopyStatement:
         |
         token=<S_IDENTIFIER> { copyStatement.setPath(token.image); }
     )
+    [ LOOKAHEAD({ getToken(1).kind == K_WITH })
+        <K_WITH> { copyStatement.setWithKeyword(true); } ]
     [
         LOOKAHEAD(2) "(" option=DatabaseOption() { options.add(option); }
         ( "," option=DatabaseOption() { options.add(option); } )*
-        ")" { copyStatement.setOptions(options); }
+        ")" {
+            if (copyStatement.isWithKeyword()
+                    || Dialect.POSTGRESQL.name().equals(getAsString(Feature.dialect))) {
+                requireDdlSyntax(!options.contains(""), "Expected a COPY option");
+            }
+            copyStatement.setOptions(options);
+        }
     ]
     { return copyStatement; }
 }

src/test/java/net/sf/jsqlparser/statement/PostgreSqlCopyTest.java

@@ -0,0 +1,100 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2026 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.statement;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import net.sf.jsqlparser.JSQLParserException;
+import net.sf.jsqlparser.expression.LongValue;
+import net.sf.jsqlparser.parser.AbstractJSqlParser.Dialect;
+import net.sf.jsqlparser.parser.CCJSqlParserUtil;
+import net.sf.jsqlparser.util.deparser.ExpressionDeParser;
+import net.sf.jsqlparser.util.deparser.SelectDeParser;
+import net.sf.jsqlparser.util.deparser.StatementDeParser;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class PostgreSqlCopyTest {
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "COPY users (email, name) FROM STDIN WITH (FORMAT csv, HEADER true)",
+            "COPY users TO STDOUT WITH (FORMAT csv, DELIMITER ';', NULL '')",
+            "COPY users TO STDOUT WITH (FORMAT csv, FORCE_QUOTE (email, name))",
+            "COPY users TO STDOUT WITH (FORMAT csv, FORCE_QUOTE *)",
+            "COPY (SELECT email FROM users) TO STDOUT WITH (FORMAT csv, HEADER true)",
+            "COPY users FROM STDIN WITH (FORMAT csv, HEADER MATCH, FORCE_NULL (name))",
+            "COPY users FROM STDIN WITH (FORMAT csv, ON_ERROR ignore, ENCODING 'UTF8')",
+            "COPY users TO '/tmp/export.csv' WITH (FORMAT csv)",
+            "COPY users TO STDOUT (FORMAT csv, HEADER true)",
+            "COPY users FROM STDIN",
+            "COPY users TO STDOUT WITH",
+            "COPY (WITH c AS (SELECT email FROM users) SELECT email FROM c) TO STDOUT WITH (FORMAT csv)",
+            "COPY (SELECT 1 UNION ALL SELECT 2) TO STDOUT WITH (FORMAT csv)"
+    })
+    void preservesCopyOptionsAndWithKeyword(String sql) throws JSQLParserException {
+        CopyStatement copy = parse(sql);
+        assertEquals(sql.contains(" WITH ") || sql.endsWith(" WITH"), copy.isWithKeyword());
+        assertRoundTrip(copy);
+        assertEquals(copy.toString(), CCJSqlParserUtil.parse(copy.toString()).toString());
+    }
+
+    @Test
+    void optionalWithKeywordCanBeEditedWithoutChangingTheOptions() throws JSQLParserException {
+        CopyStatement copy = parse("COPY users TO STDOUT WITH (FORMAT csv, HEADER true)");
+        assertTrue(copy.isWithKeyword());
+        copy.setWithKeyword(false);
+        assertEquals("COPY users TO STDOUT (FORMAT csv, HEADER true)", copy.toString());
+        assertFalse(parse(copy.toString()).isWithKeyword());
+        copy.withWithKeyword(true);
+        assertRoundTrip(copy);
+        copy.setOptions(null);
+        assertEquals("COPY users TO STDOUT WITH", copy.toString());
+        assertRoundTrip(copy);
+    }
+
+    @Test
+    void passesQueryExpressionsToTheConfiguredDeparser() throws JSQLParserException {
+        CopyStatement copy = parse("COPY (SELECT 7 FROM users WHERE id > 8) "
+                + "TO STDOUT WITH (FORMAT csv)");
+        StringBuilder buffer = new StringBuilder();
+        ExpressionDeParser expressions = new ExpressionDeParser() {
+            @Override
+            public <S> StringBuilder visit(LongValue value, S context) {
+                return getBuilder().append(value.getValue() + 100);
+            }
+        };
+        copy.accept(new StatementDeParser(expressions, new SelectDeParser(), buffer), null);
+        assertEquals("COPY (SELECT 107 FROM users WHERE id > 108) TO STDOUT WITH (FORMAT csv)",
+                buffer.toString());
+        assertRoundTrip(parse(buffer.toString()));
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"WITH ()", "WITH (FORMAT csv,)", "WITH (,FORMAT csv)",
+            "WITH FORMAT csv", "WITH (FORMAT csv,, HEADER true)", "WITH (FORCE_QUOTE (email)"})
+    void rejectsMalformedWithOptions(String options) {
+        assertThrows(JSQLParserException.class, () -> parse("COPY users TO STDOUT " + options));
+    }
+
+    private static CopyStatement parse(String sql) throws JSQLParserException {
+        return (CopyStatement) CCJSqlParserUtil.parse(sql, p -> p.withDialect(Dialect.POSTGRESQL));
+    }
+
+    private static void assertRoundTrip(CopyStatement copy) throws JSQLParserException {
+        StringBuilder buffer = new StringBuilder();
+        copy.accept(new StatementDeParser(buffer), null);
+        assertEquals(copy.toString(), buffer.toString());
+        assertEquals(copy.toString(), parse(buffer.toString()).toString());
+    }
+}