feat: add DBMS_OUTPUT package with full Oracle compatibility

Implement complete DBMS_OUTPUT package including:
- ENABLE/DISABLE buffer management
- PUT_LINE/PUT/NEW_LINE output functions
- GET_LINE/GET_LINES retrieval functions
- Full Oracle compatibility validated against Oracle 23.26

All functions work correctly in Oracle mode (port 1521) using
Oracle data types (VARCHAR2, INTEGER).

Includes comprehensive regression tests for all 7 functions.

Author: rophy

contrib/ivorysql_ora/Makefile

@@ -25,6 +25,7 @@ OBJS = \
 	src/builtin_functions/datetime_datatype_functions.o \
 	src/builtin_functions/numeric_datatype_functions.o \
 	src/builtin_functions/misc_functions.o \
+	src/builtin_functions/dbms_output.o \
 	src/merge/ora_merge.o \
 	src/sysview/sysview_functions.o \
 	src/xml_functions/ora_xml_functions.o

contrib/ivorysql_ora/ivorysql_ora_merge_sqls

@@ -1,4 +1,5 @@
 src/datatype/datatype
 src/builtin_functions/builtin_functions
+src/builtin_functions/dbms_output
 src/sysview/sysview
 src/xml_functions/xml_functions

contrib/ivorysql_ora/src/builtin_functions/dbms_output--1.0.sql

@@ -0,0 +1,114 @@
+/***************************************************************
+ *
+ * DBMS_OUTPUT package - Full Oracle-compatible implementation
+ *
+ * This provides native buffering for PUT_LINE, PUT, NEW_LINE,
+ * GET_LINE, and GET_LINES with full Oracle compatibility.
+ *
+ * Tested against Oracle Database Free 23.26.0.0
+ * See design/dbms_output/ORACLE_BEHAVIOR.md for validation details
+ *
+ ***************************************************************/
+
+-- Register C functions
+CREATE FUNCTION sys.ora_dbms_output_enable(buffer_size INTEGER DEFAULT 20000)
+RETURNS VOID
+AS 'MODULE_PATHNAME', 'ora_dbms_output_enable'
+LANGUAGE C VOLATILE;
+
+CREATE FUNCTION sys.ora_dbms_output_disable()
+RETURNS VOID
+AS 'MODULE_PATHNAME', 'ora_dbms_output_disable'
+LANGUAGE C VOLATILE;
+
+CREATE FUNCTION sys.ora_dbms_output_put_line(a VARCHAR2)
+RETURNS VOID
+AS 'MODULE_PATHNAME', 'ora_dbms_output_put_line'
+LANGUAGE C VOLATILE;
+
+CREATE FUNCTION sys.ora_dbms_output_put(a VARCHAR2)
+RETURNS VOID
+AS 'MODULE_PATHNAME', 'ora_dbms_output_put'
+LANGUAGE C VOLATILE;
+
+CREATE FUNCTION sys.ora_dbms_output_new_line()
+RETURNS VOID
+AS 'MODULE_PATHNAME', 'ora_dbms_output_new_line'
+LANGUAGE C VOLATILE;
+
+-- Create composite types for GET_LINE and GET_LINES return values
+CREATE TYPE sys.dbms_output_line AS (
+    line VARCHAR2,
+    status INTEGER
+);
+
+CREATE TYPE sys.dbms_output_lines AS (
+    lines VARCHAR2[],
+    numlines INTEGER
+);
+
+CREATE FUNCTION sys.ora_dbms_output_get_line()
+RETURNS sys.dbms_output_line
+AS 'MODULE_PATHNAME', 'ora_dbms_output_get_line'
+LANGUAGE C VOLATILE;
+
+CREATE FUNCTION sys.ora_dbms_output_get_lines(numlines INTEGER)
+RETURNS sys.dbms_output_lines
+AS 'MODULE_PATHNAME', 'ora_dbms_output_get_lines'
+LANGUAGE C VOLATILE;
+
+-- Create DBMS_OUTPUT package
+CREATE OR REPLACE PACKAGE sys.dbms_output IS
+    PROCEDURE enable(buffer_size INTEGER DEFAULT 20000);
+    PROCEDURE disable;
+    PROCEDURE put_line(a VARCHAR2);
+    PROCEDURE put(a VARCHAR2);
+    PROCEDURE new_line;
+    PROCEDURE get_line(line OUT VARCHAR2, status OUT INTEGER);
+    PROCEDURE get_lines(lines OUT VARCHAR2[], numlines IN OUT INTEGER);
+END dbms_output;
+
+CREATE OR REPLACE PACKAGE BODY sys.dbms_output IS
+
+    PROCEDURE enable(buffer_size INTEGER DEFAULT NULL) IS
+    BEGIN
+        PERFORM sys.ora_dbms_output_enable(buffer_size);
+    END;
+
+    PROCEDURE disable IS
+    BEGIN
+        PERFORM sys.ora_dbms_output_disable();
+    END;
+
+    PROCEDURE put_line(a VARCHAR2) IS
+    BEGIN
+        PERFORM sys.ora_dbms_output_put_line(a);
+    END;
+
+    PROCEDURE put(a VARCHAR2) IS
+    BEGIN
+        PERFORM sys.ora_dbms_output_put(a);
+    END;
+
+    PROCEDURE new_line IS
+    BEGIN
+        PERFORM sys.ora_dbms_output_new_line();
+    END;
+
+    PROCEDURE get_line(line OUT VARCHAR2, status OUT INTEGER) IS
+        result sys.dbms_output_line;
+    BEGIN
+        SELECT * INTO result FROM sys.ora_dbms_output_get_line();
+        line := result.line;
+        status := result.status;
+    END;
+
+    PROCEDURE get_lines(lines OUT VARCHAR2[], numlines IN OUT INTEGER) IS
+        result sys.dbms_output_lines;
+    BEGIN
+        SELECT * INTO result FROM sys.ora_dbms_output_get_lines(numlines);
+        lines := result.lines;
+        numlines := result.numlines;
+    END;
+
+END dbms_output;