Support EXECUTE ... USING for Postgres

[jonathanlehto]

adding using to execute statement

EXECUTE USING -- https://www.postgresql.org/docs/current/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN

[coveralls]

Pull Request Test Coverage Report for Build 8102619743

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 29 of 30 (96.67%) changed or added relevant lines in 3 files are covered.
• 397 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+0.1%) to 87.921%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/parser/mod.rs	8	9	88.89%

Files with Coverage Reduction	New Missed Lines	%
tests/sqlparser_mysql.rs	6	99.54%
tests/sqlparser_clickhouse.rs	8	96.04%
src/tokenizer.rs	13	89.92%
src/dialect/mod.rs	14	80.53%
tests/sqlparser_postgres.rs	14	97.96%
src/parser/mod.rs	55	83.28%
src/ast/mod.rs	287	79.66%

Totals
Change from base Build 8096363009:	0.1%
Covered Lines:	20293
Relevant Lines:	23081

---

💛 - Coveralls

[alamb]

Thank you @jonathanlehto , also breaking your changes up into smaller PRs has made it much easier to review. 🙏

[alamb]

😆

[jonathanlehto]

🙂 No problem, and thank you @alamb !