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Pre-compute the mapping between other_db.context and main.context #2038

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Aug 24, 2025
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Pre-compute the mapping between other_db.context and main.context #2038

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16 changes: 13 additions & 3 deletions coverage/sqldata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -793,18 +793,28 @@ def update(
# Handle arcs if present in other_db
if has_arcs:
self._choose_lines_or_arcs(arcs=True)

# Create context mapping table for faster lookups
con.execute_void("""
CREATE TEMP TABLE context_mapping AS
SELECT
other_context.id as other_id,
main_context.id as main_id
FROM other_db.context AS other_context
INNER JOIN main.context AS main_context ON other_context.context = main_context.context
""")

con.execute_void("""
INSERT OR IGNORE INTO main.arc (file_id, context_id, fromno, tono)
SELECT
main_file.id,
main_context.id,
context_mapping.main_id,
other_arc.fromno,
other_arc.tono
FROM other_db.arc AS other_arc
INNER JOIN other_file_mapped ON other_arc.file_id = other_file_mapped.other_file_id
INNER JOIN other_db.context AS other_context ON other_arc.context_id = other_context.id
INNER JOIN context_mapping ON other_arc.context_id = context_mapping.other_id
INNER JOIN main.file AS main_file ON other_file_mapped.mapped_path = main_file.path
INNER JOIN main.context AS main_context ON other_context.context = main_context.context
""")

# Handle line_bits if present in other_db
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