From 42ee53b027284b281058d4b58318cd6d5df0c330 Mon Sep 17 00:00:00 2001
From: lukaseder <lukas.eder@gmail.com>
Date: Fri, 9 Mar 2018 11:53:56 +0100
Subject: [PATCH] [#7171] Support parsing Oracle DECODE function

---
 .../resources/org/jooq/web/grammar-3.11.txt   |  2 ++
 .../main/java/org/jooq/impl/ParserImpl.java   | 24 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.11.txt b/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.11.txt
index 9d5f851fae..13169fd058 100644
--- a/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.11.txt
+++ b/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.11.txt
@@ -555,6 +555,7 @@ term =
 | dateLiteral
 | 'DATE_TRUNC' '(' stringLiteral ',' field ')'
 | 'DAY' '(' field ')'
+| 'DECODE' '(' field ',' field ',' field { ',' field } ')'
 | 'DENSE_RANK' ( '(' ')' over | '(' fields ')' withinGroup )
 | ( 'DEG' | 'DEGREE' ) '(' sum ')'
 | 'EXTRACT' '(' datePart 'FROM' field ')'
@@ -562,6 +563,7 @@ term =
 | 'EVERY' '(' field ')' [ filter ] [ over ]
 | 'FLOOR' '(' sum ')'
 | 'FIRST_VALUE' '(' field ')' over
+| 'GETDATE' '(' ')'
 | 'GREATEST' '(' fields ')'
 | 'GROUP_CONCAT' '(' [ 'DISTINCT' ] field [ 'ORDER BY' sortFields ] [ 'SEPARATOR' stringLiteral ] ')'
 | 'GROUP_ID' '(' ')'
diff --git a/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java b/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
index 4226d6318e..c370551c19 100644
--- a/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
@@ -3835,6 +3835,9 @@ final class ParserImpl implements Parser {
                     else if (parseFunctionNameIf(ctx, "DEGREE") || parseFunctionNameIf(ctx, "DEG"))
                         return deg((Field) parseFieldSumParenthesised(ctx));
 
+                if ((field = parseFieldDecodeIf(ctx)) != null)
+                    return field;
+
                 break;
 
             case 'e':
@@ -4923,6 +4926,27 @@ final class ParserImpl implements Parser {
         return null;
     }
 
+    private static final Field<?> parseFieldDecodeIf(ParserContext ctx) {
+        if (parseFunctionNameIf(ctx, "DECODE")) {
+            parse(ctx, '(');
+            List<Field<?>> fields = parseFields(ctx);
+            int size = fields.size();
+            if (size < 3)
+                throw ctx.expected("At least three arguments to DECODE()");
+
+            parse(ctx, ')');
+            return DSL.decode(
+                (Field<Object>)   fields.get(0),
+                (Field<Object>)   fields.get(1),
+                (Field<Object>)   fields.get(2),
+                (Field<Object>[]) (size == 3 ? EMPTY_FIELD : fields.subList(3, size).toArray(EMPTY_FIELD))
+            );
+
+        }
+
+        return null;
+    }
+
     private static final Field<?> parseFieldYearIf(ParserContext ctx) {
         if (parseFunctionNameIf(ctx, "YEAR")) {
             parse(ctx, '(');