Pretty print only CREATE TABLE

[apstndb]

This PR changes (*CreateTable).SQL()(and (*Cluster).SQL() and (*CreateRowDeletionPolicy).SQL()``) to pretty print style.

Input( testdata/input/ddl/create_table_for_format_test.sql)

create table if not exists foo (
    foo int64,
    bar float64 not null,
    baz string(255) not null options(allow_commit_timestamp = null),
    qux string(255) not null as (concat(baz, "a")) stored,
    foreign key (foo) references t2 (t2key1),
    constraint fkname foreign key (foo, bar) references t2 (t2key1, t2key2),
    check (foo > 0),
    constraint cname check (bar > 0),
    corge timestamp not null default (current_timestamp())
) primary key (foo),
  interleave in parent foobar,
  row deletion policy ( older_than ( baz, INTERVAL 30 DAY ) )

Parse-Unparsed

CREATE TABLE IF NOT EXISTS foo (
    foo INT64,
    bar FLOAT64 NOT NULL,
    baz STRING(255) NOT NULL OPTIONS (allow_commit_timestamp = null),
    qux STRING(255) NOT NULL AS (concat(baz, "a")) STORED,
    corge TIMESTAMP NOT NULL DEFAULT (current_timestamp()),
    FOREIGN KEY (foo) REFERENCES t2 (t2key1),
    CONSTRAINT fkname FOREIGN KEY (foo, bar) REFERENCES t2 (t2key1, t2key2),
    CHECK (foo > 0),
    CONSTRAINT cname CHECK (bar > 0)
) PRIMARY KEY (foo),
INTERLEAVE IN PARENT foobar,
ROW DELETION POLICY ( OLDER_THAN ( baz, INTERVAL 30 DAY ))

Related issues

• part of Improve SQL() formats for specific AST nodes #233

[makenowjust]

LGTM. Thank you.