code: void removeColumn(String schema, String table, String column) {
          StringBuilder sql = new StringBuilder("ALTER TABLE ");
          sql.append(sqlgGraph.getSqlDialect().maybeWrapInQoutes(schema));
          sql.append(".");
          sql.append(sqlgGraph.getSqlDialect().maybeWrapInQoutes(table));
          sql.append(" DROP COLUMN IF EXISTS ");
          sql.append(sqlgGraph.getSqlDialect().maybeWrapInQoutes(column));
          if (sqlgGraph.getSqlDialect().supportsCascade()) {
              sql.append(" CASCADE");
          }
          if (sqlgGraph.getSqlDialect().needsSemicolon()) {
              sql.append(";");
          }
          if (logger.isDebugEnabled()) {
              logger.debug(sql.toString());
          }
          Connection conn = sqlgGraph.tx().getConnection();
          try (Statement stmt = conn.createStatement()) {
              stmt.execute(sql.toString());
          } catch (SQLException e) {
              throw new RuntimeException(e);
          }
      }
docs: remove a column from the table
  
  @param schema the schema
  @param table  the table name
  @param column the column name