feat: BigQuery SELECT AS STRUCT ... and SELECT AS VALUE ...

Signed-off-by: Andreas Reichel <[email protected]>

Author: manticore-projects

src/main/java/net/sf/jsqlparser/statement/select/PlainSelect.java

@@ -29,7 +29,12 @@
 @SuppressWarnings({"PMD.CyclomaticComplexity"})
 public class PlainSelect extends Select {
 
+    public enum BigQuerySelectQualifier {
+        AS_STRUCT, AS_VALUE
+    }
+
     private Distinct distinct = null;
+    private BigQuerySelectQualifier bigQuerySelectQualifier = null;
     private List<SelectItem<?>> selectItems;
     private List<Table> intoTables;
     private FromItem fromItem;
@@ -369,6 +374,15 @@ public void setDistinct(Distinct distinct) {
         this.distinct = distinct;
     }
 
+    public BigQuerySelectQualifier getBigQuerySelectQualifier() {
+        return bigQuerySelectQualifier;
+    }
+
+    public PlainSelect setBigQuerySelectQualifier(BigQuerySelectQualifier bigQuerySelectQualifier) {
+        this.bigQuerySelectQualifier = bigQuerySelectQualifier;
+        return this;
+    }
+
     public Expression getHaving() {
         return having;
     }
@@ -478,6 +492,18 @@ public StringBuilder appendSelectBodyTo(StringBuilder builder) {
         if (distinct != null) {
             builder.append(distinct).append(" ");
         }
+
+        if (bigQuerySelectQualifier != null) {
+            switch (bigQuerySelectQualifier) {
+                case AS_STRUCT:
+                    builder.append("AS STRUCT ");
+                    break;
+                case AS_VALUE:
+                    builder.append("AS VALUE ");
+                    break;
+            }
+        }
+
         if (top != null) {
             builder.append(top).append(" ");
         }

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

@@ -179,6 +179,17 @@ public void visit(PlainSelect plainSelect) {
 
         deparseDistinctClause(plainSelect, plainSelect.getDistinct());
 
+        if (plainSelect.getBigQuerySelectQualifier() != null) {
+            switch (plainSelect.getBigQuerySelectQualifier()) {
+                case AS_STRUCT:
+                    buffer.append("AS STRUCT ");
+                    break;
+                case AS_VALUE:
+                    buffer.append("AS VALUE ");
+                    break;
+            }
+        }
+
         Top top = plainSelect.getTop();
         if (top != null) {
             visit(top);

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

@@ -2395,6 +2395,15 @@ PlainSelect PlainSelect() #PlainSelect:
         )
     ]
 
+    [
+        <K_AS>
+        (
+            <K_STRUCT> { plainSelect.setBigQuerySelectQualifier( PlainSelect.BigQuerySelectQualifier.AS_STRUCT ); }
+            |
+            <K_VALUE> { plainSelect.setBigQuerySelectQualifier( PlainSelect.BigQuerySelectQualifier.AS_VALUE ); }
+        )
+    ]
+
     [ LOOKAHEAD(2) top = Top() { plainSelect.setTop(top);    } ]
 
     selectItems=SelectItemsList()

src/test/java/net/sf/jsqlparser/statement/select/BigQueryTest.java

@@ -80,4 +80,16 @@ void testAggregateFunctionHaving() throws JSQLParserException {
                 "SELECT ANY_VALUE(fruit HAVING MAX sold) AS a_highest_selling_fruit FROM Store;\n";
         TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
     }
+
+    @Test
+    void testAsStruct() throws JSQLParserException {
+        String sqlStr = "SELECT ARRAY(SELECT AS STRUCT 1 a, 2 b)";
+        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+    }
+
+    @Test
+    void testAsValue() throws JSQLParserException {
+        String sqlStr = "SELECT AS VALUE STRUCT(1 AS a, 2 AS b) xyz";
+        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+    }
 }