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fix: skip MySQL expression indexes with null COLUMN_NAME during introspection #5576

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fix: skip MySQL expression indexes with null COLUMN_NAME during introspection #5576

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6 changes: 5 additions & 1 deletion drizzle-kit/src/serializer/mysqlSerializer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -862,12 +862,16 @@ export const fromDatabase = async (
const tableSchema = idxRow['TABLE_SCHEMA'];
const tableName = idxRow['TABLE_NAME'];
const constraintName = idxRow['INDEX_NAME'];
const columnName: string = idxRow['COLUMN_NAME'];
const columnName: string | null = idxRow['COLUMN_NAME'];
const isUnique = idxRow['NON_UNIQUE'] === 0;

const tableInResult = result[tableName];
if (typeof tableInResult === 'undefined') continue;

// MySQL 8+ functional/expression indexes have COLUMN_NAME = NULL.
// Skip these since Drizzle doesn't support expression indexes yet.
if (columnName === null) continue;

// if (tableInResult.columns[columnName].type === "serial") continue;

indexesCount += 1;
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