Some filters are not correctly pushed down

[ajnavarro]

Having the following query:

explain format=tree SELECT 
	files.`repository_id` 
FROM files 
INNER JOIN 
	commit_files ON 
	(((files.`repository_id` = commit_files.`repository_id`) 
	AND (files.`file_path` = commit_files.`file_path`)) 
	AND (files.`blob_hash` = commit_files.`blob_hash`)) 
	AND (files.`tree_hash` = commit_files.`tree_hash`) 
INNER JOIN ref_commits ON 
	(commit_files.`repository_id` = ref_commits.`repository_id`) 
	AND (commit_files.`commit_hash` = ref_commits.`commit_hash`) 
WHERE 
	files.`file_path` IS NOT NULL 
	AND ref_commits.`ref_name` IS NOT NULL 
	AND ref_commits.`history_index` IS NOT NULL 
	AND ref_commits.`ref_name` REGEXP '^refs/heads/HEAD/' 
	AND ref_commits.`history_index` = 0 
	AND (NOT (files.`file_path` REGEXP '^vendor.*')) 
	AND ((((files.`blob_content` REGEXP '(?i)facebook.*[\'\\"][0-9a-f]{32}[\'\\"]') 
		OR (files.`blob_content` REGEXP '(?i)twitter.*[\'\\"][0-9a-zA-Z]{35,44}[\'\\"]')) 
		OR (files.`blob_content` REGEXP '(?i)github.*[\'\\"][0-9a-zA-Z]{35,40}[\'\\"]')) 
		OR ((files.`blob_content` REGEXP 'AKIA[0-9A-Z]{16}') 
		OR (files.`blob_content` REGEXP '(?i)reddit.*[\'\\"][0-9a-zA-Z]{14}[\'\\"]'))) 
		OR ((((files.`blob_content` REGEXP '(?i)heroku.*[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}') 
		OR (files.`blob_content` REGEXP '.*-----BEGIN PRIVATE KEY-----.*')) 
		OR (files.`blob_content` REGEXP '.*-----BEGIN RSA PRIVATE KEY-----.*')) 
		OR ((files.`blob_content` REGEXP '.*-----BEGIN DSA PRIVATE KEY-----.*') 
		OR (files.`blob_content` REGEXP '.*-----BEGIN OPENSSH PRIVATE KEY-----.*')));

The output plan is the following one:

plan: Exchange(parallelism=8)
plan:  └─ Project(files.repository_id)
plan:      └─ Filter(
				NOT(files.file_path IS NULL) 
				AND NOT(ref_commits.ref_name IS NULL) 
				AND NOT(ref_commits.history_index IS NULL) 
				AND ref_commits.ref_name REGEXP "^refs/heads/HEAD/" 
				AND ref_commits.history_index = 0 
				AND NOT(files.file_path REGEXP "^vendor.*") 
				AND files.blob_content REGEXP "(?i)facebook.*['\\\"][0-9a-f]{32}['\\\"]" 
					OR files.blob_content REGEXP "(?i)twitter.*['\\\"][0-9a-zA-Z]{35,44}['\\\"]" 
					OR files.blob_content REGEXP "(?i)github.*['\\\"][0-9a-zA-Z]{35,40}['\\\"]" 
					OR files.blob_content REGEXP "AKIA[0-9A-Z]{16}" 
					OR files.blob_content REGEXP "(?i)reddit.*['\\\"][0-9a-zA-Z]{14}['\\\"]" 
					OR files.blob_content REGEXP "(?i)heroku.*[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}" 
					OR files.blob_content REGEXP ".*-----BEGIN PRIVATE KEY-----.*" 
					OR files.blob_content REGEXP ".*-----BEGIN RSA PRIVATE KEY-----.*" 
					OR files.blob_content REGEXP ".*-----BEGIN DSA PRIVATE KEY-----.*" 
					OR files.blob_content REGEXP ".*-----BEGIN OPENSSH PRIVATE KEY-----.*")
plan:          └─ Filter(commit_files.repository_id = ref_commits.repository_id AND commit_files.commit_hash = ref_commits.commit_hash)
plan:              └─ SquashedTable(ref_commits, commit_files, files)
plan:                  ├─ Columns
plan:                  │   ├─ Column(repository_id, TEXT, nullable=false)
plan:                  │   ├─ Column(file_path, TEXT, nullable=false)
plan:                  │   ├─ Column(blob_hash, TEXT, nullable=false)
plan:                  │   ├─ Column(tree_hash, TEXT, nullable=false)
plan:                  │   ├─ Column(tree_entry_mode, TEXT, nullable=false)
plan:                  │   ├─ Column(blob_content, BLOB, nullable=false)
plan:                  │   ├─ Column(blob_size, INT64, nullable=false)
plan:                  │   ├─ Column(repository_id, TEXT, nullable=false)
plan:                  │   ├─ Column(commit_hash, TEXT, nullable=false)
plan:                  │   ├─ Column(file_path, TEXT, nullable=false)
plan:                  │   ├─ Column(blob_hash, TEXT, nullable=false)
plan:                  │   ├─ Column(tree_hash, TEXT, nullable=false)
plan:                  │   ├─ Column(repository_id, TEXT, nullable=false)
plan:                  │   ├─ Column(commit_hash, TEXT, nullable=false)
plan:                  │   ├─ Column(ref_name, TEXT, nullable=false)
plan:                  │   └─ Column(history_index, INT64, nullable=false)
plan:                  └─ Filters
plan:                      ├─ files.repository_id = commit_files.repository_id
plan:                      ├─ files.file_path = commit_files.file_path
plan:                      ├─ files.blob_hash = commit_files.blob_hash
plan:                      └─ files.tree_hash = commit_files.tree_hash

At least, AND ref_commits.history_index = 0 and AND ref_commits.ref_name REGEXP "^refs/heads/HEAD/" should be pushed down.