Be sure that the column name lengths don't exceed 255 characters and don't contain special characters. For more information about column requirements, see Column.
Check for malformed data. For example, if the column name doesn't conform to the regular expression pattern "[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\t]", then the crawler doesn't work.
Check for columns that have a length of 0. This happens when columns in the data don't match the data format of the table.
If your data contains DECIMAL columns with the "(precision, scale)" format, then be sure that the scale value is less than or equal to the precision value.
In the schema definition of your table, be sure that the Type of each of your columns isn't longer than 131,072 bytes. For more information, see Column structure.
If your crawler fails with either of the following errors, then be sure that the total schema definition of your table is not larger than 1 MB:
"Unable to create table in Catalog"
"Payload size of request exceeded limit"
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