Support for DROP FUNCTION.

Author: cincuranet

Provider/src/FirebirdSql.Data.FirebirdClient/Isql/FbBatchExecution.cs

@@ -161,6 +161,7 @@ public void Execute(bool autoCommit = true)
 						case SqlStatementType.DropDomain:
 						case SqlStatementType.DropException:
 						case SqlStatementType.DropExternalFunction:
+						case SqlStatementType.DropFunction:
 						case SqlStatementType.DropFilter:
 						case SqlStatementType.DropGenerator:
 						case SqlStatementType.DropIndex:

Provider/src/FirebirdSql.Data.FirebirdClient/Isql/FbScript.cs

@@ -332,6 +332,10 @@ static bool IsSetTermStatement(string statement, out string newTerm)
 					{
 						return SqlStatementType.DropExternalFunction;
 					}
+					if (sqlStatement.StartsWith("DROP FUNCTION", StringComparison.OrdinalIgnoreCase))
+					{
+						return SqlStatementType.DropFunction;
+					}
 					if (sqlStatement.StartsWith("DROP FILTER", StringComparison.OrdinalIgnoreCase))
 					{
 						return SqlStatementType.DropFilter;

Provider/src/FirebirdSql.Data.FirebirdClient/Isql/SqlStatementType.cs

@@ -247,6 +247,11 @@ public enum SqlStatementType
 		/// </summary>
 		DropExternalFunction,
 
+		/// <summary>
+		/// Represents the SQL statement: <b>DROP FUNCTION</b>
+		/// </summary>
+		DropFunction,
+
 		/// <summary>
 		/// Represents the SQL statement: <b>DROP FILTER</b>
 		/// </summary>