Fir 32148 resultset getters case insensitive

src/integrationTest/java/integration/tests/StatementTest.java

@@ -398,4 +398,19 @@ void failingQuery(String query) throws SQLException {
 			assertThrows(SQLException.class, () -> statement.execute(query));
 		}
 	}
+
+	@Test
+	void caseInsensitiveGetter() throws SQLException {
+		try (Connection connection = createConnection(); Statement statement = connection.createStatement();
+			 ResultSet rs = statement.executeQuery("select table_schema, table_name as NAME from information_schema.tables")) {
+			while(rs.next()) {
+				assertEquals(rs.getString("table_schema"), rs.getString("TABLE_SCHEMA"));
+				assertEquals(rs.getString("table_schema"), rs.getString("Table_Schema"));
+				assertEquals(rs.getString("table_schema"), rs.getString("TaBlE_ScHeMa"));
+				assertEquals(rs.getString("name"), rs.getString("NAME"));
+				assertEquals(rs.getString("name"), rs.getString("NaMe"));
+			}
+
+		}
+	}
 }

src/main/java/com/firebolt/jdbc/resultset/FireboltResultSet.java

@@ -48,14 +48,15 @@
 import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.Calendar;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.TimeZone;
+import java.util.TreeMap;
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 
 import static com.firebolt.jdbc.util.StringUtil.splitAll;
+import static java.lang.String.CASE_INSENSITIVE_ORDER;
 import static java.lang.String.format;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Optional.ofNullable;
@@ -100,7 +101,7 @@ public FireboltResultSet(InputStream is, String tableName, String dbName, Intege
 	private FireboltResultSet() {
 		reader = new BufferedReader(new InputStreamReader(new ByteArrayInputStream("".getBytes()), UTF_8)); // empty InputStream
 		resultSetMetaData = new FireboltResultSetMetaData(null, null, List.of());
-		columnNameToColumnNumber = new HashMap<>();
+		columnNameToColumnNumber = new TreeMap<>(CASE_INSENSITIVE_ORDER);
 		currentLine = null;
 		columns = new ArrayList<>();
 		statement = null;
@@ -534,7 +535,7 @@ private int getColumnIndex(int colNum) throws SQLException {
 	}
 
 	private Map<String, Integer> getColumnNamesToIndexes(String[] fields) {
-		Map<String, Integer> columnNameToFieldIndex = new HashMap<>();
+		Map<String, Integer> columnNameToFieldIndex = new TreeMap<>(CASE_INSENSITIVE_ORDER);
 		if (fields != null) {
 			for (int i = 0; i < fields.length; i++) {
 				columnNameToFieldIndex.put(fields[i], i + 1);

src/test/java/com/firebolt/jdbc/resultset/FireboltResultSetTest.java

@@ -24,6 +24,7 @@
 import java.sql.Array;
 import java.sql.Date;
 import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
 import java.sql.RowId;
 import java.sql.SQLException;
 import java.sql.SQLFeatureNotSupportedException;
@@ -1242,6 +1243,28 @@ void shouldReturnUrl() throws SQLException, MalformedURLException {
 		assertNull(resultSet.getURL("url"));
 	}
 
+	@Test
+	void shouldBeCaseInsensitive() throws SQLException {
+		inputStream = getInputStreamWithCommonResponseExample();
+		resultSet = new FireboltResultSet(inputStream, "a_table", "a_db", 65535);
+		resultSet.next();
+		ResultSetMetaData rsmd = resultSet.getMetaData();
+		int n = rsmd.getColumnCount();
+		for (int i = 1; i <= n; i++) {
+			String columnName = rsmd.getColumnName(i);
+			Object value = resultSet.getObject(columnName);
+			Object upperCaseValue = resultSet.getObject(columnName.toUpperCase());
+			Object lowerCaseValue = resultSet.getObject(columnName.toLowerCase());
+			if (rsmd.getColumnType(i) == Types.ARRAY) {
+				assertArrayEquals((Object[])value, (Object[])upperCaseValue);
+				assertArrayEquals((Object[])value, (Object[])lowerCaseValue);
+			} else {
+				assertEquals(value, upperCaseValue);
+				assertEquals(value, lowerCaseValue);
+			}
+		}
+	}
+
 	private void assertStream(byte[] expected, InputStream stream) throws IOException {
 		assertArrayEquals(expected, stream == null ? null : stream.readAllBytes());
 	}