presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitShowSchemas
class Formatter:        @Override
        protected Void visitShowSchemas(ShowSchemas node, Integer context)
        {
            builder.append("SHOW SCHEMAS");

            if (node.getCatalog().isPresent()) {
                builder.append(" FROM ")
                        .append(node.getCatalog().get());
            }

            node.getLikePattern().ifPresent((value) ->
                    builder.append(" LIKE ")
                            .append(formatStringLiteral(value)));

            node.getEscape().ifPresent((value) ->
                    builder.append(" ESCAPE ")
                            .append(formatStringLiteral(value)));

            return null;
        }